Why are there only two elements in the first period of the periodic table?(1 point)
because the first two elements both start with H and are grouped together
because the next elements have other things in common and they need to be arranged together
because each row increases in atomic mass by a specific number, so anything over five is in the second row
because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits
Answers
Answer:
because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits
There are only two elements in the first period of the periodic table (statement 4) because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by the number of orbits
A period is defined as an interval required for a cycle to repeat itself.
A period is a horizontal row of the periodic table. Seven periods in the periodic table, with each one beginning from the far left to right.Periods may contain as few as two elements and as many as thirty-two elements. A new period starts when a new number of orbit or principal energy levels begins filling with electrons.Period 1 has only two elements (hydrogen and helium) as they have electrons in only the 1st energy level or first orbit and each period on the table is organized by the number of orbits or level of energy.
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Related Questions
what occurs at the end of a negative cell if an electric cell is placed in a closed circuit?
Answers
1. Current means flow of electrons and electrons are negative charged and so are attracted to the positive end of the battery and repelled by the negative end.
2. When battery is connected in a circuit that lets the electron flow through it, they flow from negative to positive.
3. When negative terminal of cell is connected to other negative terminal of the cell in a particular circuit then, current will not flow in circuit as electrons cannot flow from negative to negative terminal.
On earth, the acceleration due to gravity is (A. 32 ft/sec2
B. 60 miles/hour).
Answers
every morning Tom walks along a straight road from his home to a bus stop,a distance of 160 meters.The graph shows his journey on one particular day?
Answers
Answer:
Tom walked until he was 100 metres from his home. Then, he realised that he had dropped his homework, so he turned around and went 60 metres to pick it up again. He again turned back and started to walk faster to get to the bus stop on time. He got to the bus stop 100 seconds after leaving his home and waited for the bus.
Explanation:
A playground merry-go-round spins about its axis with negligible friction. A child moves from the center of the merry-go-round to the rim. For this system, indicate which of the following quantities change.
A. Potential energy
B. Angular momentum
C. Mass
D. Moment of inertia
E. Angular speed
F. Rotational kinetic energy
Answers
Answer:
B
Explanation:
In this process on merry go round there is not any external torque so angular momentum will be conserve. Mass is always conserved.
How many bones does the baby have and why does the baby has more bones than the older ones
Answers
Answer:
300
Explanation:
when the baby are born then they would have 300 bones but when they grow they would have 206 cause when they grow that 94 bones would convert into different kind of proton and energy I guess
wat is the difference between resultance and equilibrum
Answers
Explanation:
A resultant force is the sum of the forces on an object.
Forces are said to be in equilibrium when the resultant force is zero. This means the object will not accelerate.
You push a shopping cart for fun with a force of 60N. If the shopping cart has a mass of 12kg, what is the
acceleration of the cart?
Answers
Answer:
[tex]\huge\boxed{\sf a = 5 \ ms^{-2}}[/tex]
Explanation:
Given:
Force = f = 60 N
Mass = m = 12 kg
Required:
Acceleration = a = ?
Formula:
F = ma
Solution:
Rearranging formula
a = F / m
a = 60 / 12
a = 5 ms⁻²
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Peace!Q=U+pV solve for p please
Answers
Answer:
Q = U + pv
Q - U = pv
(Q - U) / v = p
Which term describes the repeated arrangement of the same molecule? (1 point)
O molecular model
O atoms
O bonds
o extended structure
Answers
The term which best describes the repeated arrangement of the same molecule is: D. extended structure.
An atom can be defined as the smallest unit which comprises the matter that forms all chemical elements. Thus, atoms are typically the fundamental building blocks of matter and as such determines (defines) the structure of a chemical element.
Generally, atoms are typically made up of three (3) distinct particles and these are;
Protons.Neutrons.Electrons.In Chemistry, a molecule can be defined as a group of two or more atoms that are chemically bonded together by means of shared electrons and represents the smallest fundamental unit of a substance or chemical compound.
Basically, when the same molecule are arranged repeatedly it is typically referred to as an extended structure.
In conclusion, the term which best describes the repeated arrangement of the same molecule of a chemical compound or substance is an extended structure.
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what do you think the benefits of nuclear energy are
Answers
The benefits of nuclear energy should involve less energy cost, accurate, release zero emissions of carbon, cost-effective, etc.
The information related to nuclear energy is:
It is to used for nuclear reactions in order to generate electricity.Nuclear power could be received from nuclear fission, decay, and its reactions.The majority of electricity should be generated via nuclear fission of both uranium & plutonium for nuclear power plants.Therefore we can conclude that The benefits of nuclear energy should involve less energy cost, accuracy, release zero emissions of carbon, cost-effective, etc.
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How long would it take a runner to go 5000 meters at a speed of 5 meters per second.
Answers
[tex]\\ \sf\longmapsto Speed=\dfrac{Distance}{Time}[/tex]
[tex]\\ \sf\longmapsto Time=\dfrac{Distance}{Speed}[/tex]
[tex]\\ \sf\longmapsto Time=\dfrac{5000}{5}[/tex]
[tex]\\ \sf\longmapsto Time=1000s[/tex]
True or false: the largest planet in the solar system is saturn
Answers
Answer:
nope! it's actually Jupiter
Explanation:
Jupiter is your answer
State which type of variable is plotted on the x-axis
and which type is plotted on the y-axis.
Answers
Answer:
Often the independent variable is plotted on the x-axis - and example might be time (an experiment where time is measured by a watch or an independent mechanical device)
The dependent variable is often plotted on the y-axis - and example here might be the velocity or the acceleration,
It may be the responsibility of the experimenter to determine the value of the dependent variable by some type of measurement
Name the type of forces involved in the following situations:
a) A rolling ball stops after covering some distance.
b) A magnet attracts a piece of iron.
c) Every object in the universe is attracted to each other.
Answers
Answer:
a. Frictional force
b. Magnetic force
c. Gravitational force
Answer:
frictional force
magnetic force
gravitational force
hope this helps!
Pls answer this quastion
A ____________ is the smallest functional and structural unit of all living organisms.
An ___________ is any living thing that carries out its own life processes.
____________ was the first to describe cells. He looked at the bark of a cork tree under a microscope.
Why are most cells small?
Cells are small because their size is __________ by their outer barrier.
As the cell grows, they will require _______ nutrients and produce ______ waste products.
If cells get too large, they cannot take in ________ nutrients or get rid of enough wastes.
The __________to _________ ratio of a cell is the ratio of the outer surface to the cell’s volume.
The ________ the cell, the ________ this ratio.
What is cell theory?
The cell theory lists three basic characteristics of all cells and organisms.
________________________________________________________
________________________________________________________
________________________________________________________
Notable scientists:
Robert Hooke was the first to describe cells. He looked at the bark of a cork tree under a microscope.
_____________________ was the first to describe living cells.
_____________________ concluded that all plants are made of cells
_____________________ determined that all animal tissues are made of cells
_____________________ proposed that cells could form only from the division of other cells
Which theory does this fall under? ______
______________ organisms
Multicellular organisms
Made up of one cell
Made up of _____ than one cell
The single cell must carry out all life functions
These organism have _____________ cell functions
Describe the differences between the two types of cells.
Prokaryotes
Eukaryotes
_____________________
_____________________
_____________________
DNA is found in the __________________
_____________________
_____________________
_____________________
DNA is found in the _____________________
Answers
Answer:
1. Cell
2.Cells
3.Robert Hooke
Animal
Cell
The surface area to the volume is smaller as the cell get larger
5.
1
Shown above is a wire that is carrying current in a magnetic field. The magnetic field
is coming out the plane of the page.
What is the direction of deflection of the wire?
A) Upwards
B) Downwards
C) To the left
D) To the right
Answers
Answer:
The direction of defliection of the site to the left I think ..
For water, which takes more energy, melting or evaporating?
Answers
Answer:
melting
Explanation:
that works best
Please help what is the mass ??
•358.20 g
•358.3 g
•358.30 g
•358.2 g
Answers
Answer:
The answer is 358.2 g.
A student drops a feather off the top a building. The feather averages 1.5m/s while
fluttering to the ground.
Determine all unknowns.
Answers
The acceleration with which an object falls through a fluid decreases as the speed of the object increases under gravity, to the point where the speed becomes constant, which is known as the terminal speed of the object
The unknown parameters are the mass of the feather, the density of the air, the feather's projected area and the coefficient of drag
The reason the above selected parameters are the correct unknowns is as follows;
The known parameter;
The speed of the feather the student drops off the building's top = 1.5 m/s
The required parameter;
The unknown parameters
Method;
Determine the terminal velocity parameters of the feather
The terminal velocity, [tex]\mathbf{V_t}[/tex], of an item is the maximum steady speed the item reaches as it falls through a fluid. The terminal velocity of the feather is given by the following equation
[tex]Terminal \ velocity, V_t = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]
Where;
[tex]\mathbf{V_t}[/tex] = Terminal velocity = The constant speed of the feather
m = Mass of the feather
g = Gravitational acceleration
ρ = Air density
A = The feather's projected area
[tex]C_d[/tex] = Drag coefficient
The average speed of the feather = 1.5 m/s = The feathers typical or most common speed = The terminal velocity of the feather, [tex]\mathbf{V_t}[/tex];
Plugging in [tex]\mathbf{V_t}[/tex] = 1.5 m/s gives;
[tex]V_t = 1.5 \ m/s = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]
Therefore, the unknown parameters with regard to the feather falling are the parameters that are to be specified, including;
The mass of the featherThe density of air at the locationThe feather's projected areaThe drag coefficientLearn more about terminal velocity here:
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a car travels in a constant speed around BCDA. Where is acceleration present
1) BC and CD
2) BC and AC
3) AB and CD
(sorry for the awk looking diagram its supposed to be all connected btw)
Answers
Answer:
3) AB and CD
Explanation:
because where velocity is constant acceleration is equal to Zero
define about the different types of silk found around the world
Answers
Answer:
In short, there are four types of natural silk produced around the world: Mulberry silk, Eri silk, Tasar silk and Muga silk. Mulberry silk contributes around as much as 90% of silk production, with the mulberry silkworm generally being regarded as the most important.
What is the economical application of change of state of matter
Answers
Answer:
Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again.
the distance between neha and diya's house is 200 km. a car take 2 hours to cover this this distance. find the speed of the car.
Answers
Answer:
27.8m/s
Explanation:
V= d/t
S. I unit of distance (displacement) is m
S. I unit of time is seconds
V= d/t
V = (200 x 1000)m / (2 x 60 x 60)s
V= 27.8 m/s
1. Review the data collected in the lab and explain the movement of the cart relative to the reference point(starting point). Be sure to mention how far from the origin the cart gets in each time interval.
2. Review the data collected in the lab and determine the relationship between the position of the car relative to the reference point and the amount of time in each time interval in other words as time goes by how does the position change?
3. For this response he will show your work on calculating the speed of the car during the lab remember you are used to change and slope equation or (y^2-y^1)/(x^2-x^1).
Now let’s make connections to the data table the horizontal variable is the time which we will represent with t and the vertical variable is position which we will represent with an x using this we can rewrite the equation above to the following
(final position - initial position)/
(final time - initial time)
Answers
When the data of the position and time are available, the velocity which is the ratio of change in position to change in time which is the same as the slope of the graph of the data can be calculated. For the car, we have;
1. The car moves progressively further as the time interval increases
2. The relationship between the position of the car and the time interval is that the car moves approximately 0.02 units of distance for each change in time of 0.05
3. The speed of the car is 0.398
The reason for arriving at the above values are as follows:
1. From the given data, we have that the cart moves progressively further from the start for each time interval increase, such that the cart moves progressively further from the origin in each time interval increases
[tex]\begin{array}{|c|c|} \mathbf{ Time} & \mathbf{ Position}\\2.2&0.8963\\2.25& 0.9164\\2.3 & 0.9375\\2.35 & 0.9581\\2.4 & 0.9759\end{array}\right][/tex]
2. From the given data, we have;
At time t = 2.2, the position = 0.8963
At time t = 2.25, the position = 0.9164
The change in position for a change in time from 2.2 to 2.25 is, Δx = 0.9164 - 0.8963 = 0.0201
Similarly, for the change in time from 2.25 to 2.3, which is a change of 0.05 seconds, we have;
Δx = 0.9375 - 0.9164 = 0.0211
The next interval is 2.3 to 2.35, Δx = 0.9581 - 0.9375 = 0.0206
Therefore, the change in the distance from the origin increases by approximately 0.02 for each increase in tome by Δt = 0.05 seconds
3. The slope equation is presented as follows;
[tex]Slope = \dfrac{y_2 - y_1 }{x_2 - x_1}[/tex]
The speed of the car is given by the slope of the distance time graph, where;
The horizontal variable, x, is the time, t (x = t)
The vertical variable, y, is the position, x (y = x)
Based on the given assignment of the variables to the x, and y, variables, we have;
[tex]Slope = Speed = \dfrac{y_2 - y_1 }{x_2 - x_1} = \dfrac{x_2 -x_1}{t_2 - t_1} = \mathbf{\dfrac{Final \ position - Initial \ position }{Final \ time - Initial \ time}}[/tex]
Plugging in the values in the table, we have;
[tex]Speed = \dfrac{Final \ position - Initial \ position }{Final \ time - Initial \ time} = \mathbf{\dfrac{0.9759 - 0.8963 }{2.4 - 2.2}} = 0.398[/tex]
The speed of the car = 0.398
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Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)
Metals have low electronegativity, so they are conductive because they pass charges easily.
An attraction between a positive charge and a negative charge is created.
O The bonds can shift because valence electrons are held loosely and move freely.
OTwo metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
Answers
Answer:
The bonds can shift because valence electrons are held loosely and more freely
Explanation:
Please give brainliest if you can,have a good day<3 :)
Answer:
The bonds can shift because valence electrons are held loosely and move freely.
Explanation: got it right
in which of the following conditions would a person NOT hear an echo!100 points to the first correct awnser
Answers
Answer:
Umm well a person can not hear when a it snows or maybe like a snow storm
Explanation: snow is so light you dont hear it land but you can see it
Answer: the answer is, A sound wave reaches the ear, and the reflected wave reaches the ear less than 0.1 seconds later
Explanation: PENN
what is the law of conservation of Momentum?
Answers
Answer:
Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant
plz help i will mark brainlyist.
describe how gravitational force is related to mass and distance
compare the magnitude and range of the four basic forces—gravitational, electromagnetic, weak nuclear and strong nuclear
Answers
Answer:
please mark me brainliest
Explanation:
Gravitational force -an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.
The Four Fundamental Forces of Nature are Gravitational force, Weak Nuclear force, Electromagnetic force and Strong Nuclear force. The weak and strong forces are effective only over a very short range and dominate only at the level of subatomic particles. Gravity and Electromagnetic force have infinite range.
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?(1 point)
Metals have low electronegativity, so they are conductive because they pass charges easily.
Metals have low electronegativity, so they are conductive because they pass charges easily.
Two metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
Two metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
An attraction between a positive charge and a negative charge is created.
An attraction between a positive charge and a negative charge is created.
The bonds can shift because valence electrons are held loosely and move freely.
Answers
Conductivity is possible in metals because metallic bonds can shift due to the fact that valence electrons are held loosely and move freely.
WHAT ARE METALLIC BONDS:
Metallic bonds are bonds that holds metals together. In metallic bonding, electrons are shared between positive metal ions. The electrons that flow in metals are delocalized, hence, are able to move freely. These free moving electrons are responsible for the high conductivity that metals exhibit.Therefore, conductivity is possible in metals because metallic bonds can shift due to the fact that valence electrons are held loosely and move freely.
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valence electrons are held loosely and move freely.
Explanation:
Which information about an atom can a period number give you?(1 point)
how many energy levels it has
the number of valence electrons it has
how many bonds it will make
the ionic charge it forms
Answers
Answer:
How many energy levels it has
The period to which an atom belongs can tell how many energy levels it has.
The period table of an element are categorised into horizontal rows (periods) and vertical columns (groups).
Each elements falls under a particular row (i.e period) and column (i.e group).
The group number talks about the number of valence electron(s) in the outermost shell of the atom while the period number talks about the number of energy levels (or number of shells) the atom has.
This is the most reason why elements in the same group have the same number of valence electron(s) while elements in the same period have the same number of energy levels
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