Use the information below to explain why the atomic radius decreases across a period.

I believe your answer would be

2.781

Answer:

There are 6.023 x 10^23 fluorine atoms.

Explanation:

Answer:

Convection currents occur when a fluid is near a heat source.

Explanation:

Heat sources provide energy to their surroundings. When fluid receives this energy, molecules inside it move around more, spacing out from each other and lowering the density.

We know from helium balloons that things with lower densities than their surroundings are pushed upwards. Therefore, the fluid close to the heat source moves upwards, as it is hotter than the rest.

As this fluid moves up, cooler molecules drift down, succumbing to gravity.

As hot molecules move up and further from the heat source, they cool down, and drop. As colder molecules drop and move towards the heat source, they heat up, and begin rising.

This results in a circular motion called a convection current. It is present in the strong winds at the seaside and in the magma in the Earth's mantle.

Answer:

They have the same number of electrons as protons.

Explanation:

Atoms are electrically neutral means that all the charges within the atom are balance to equal neutral. An atom has the same number of protons as it does electrons, therefore the charge is neutral.

An ion has a different number of electrons than protons, making the ion either positively or negatively charged.

Answer:

Hi! I am currently taking AP Chemistry, I'll try to help you out.

That quote basically just means that the atom as a whole is not positively or negatively charged. Atoms are made up of protons, neutrons, and electrons. Neutrons are neutrally charged. Protons are positively electrically charged. And electrons are negatively electrically charged. In atoms, if there is an even number of protons and electrons, they can cancel each other's charges out, which results in the atom as a whole being electrically neutral.

Hope this helps! Feel free to mark me Brainliest if you feel this helped. :)

Answer:

0J

Explanation:

Work = Force * Distance

Since the distance (or the displacement) in this problem is 0, hence, no work is done. W = 150*0 = 0. The mass of the object is just trying to trick you. Hopes this helps!

Answer:

pints

Explanation:

Answer:

B: pints

fl.oz.

Explanation:

Sodium-22 remain : 1.13 g

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually, radioactive elements have an unstable atomic nucleus.  

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

half-life = t 1/2=2.6 years

T=15.6 years

No=72.5 g

[tex]\tt Nt=72.5.\dfrac{1}{2}^{15.6/2.6}\\\\Nt=72.5.\dfrac{1}{2}^6\\\\Nt=1.13~g[/tex]

If a large office building is 1.07 x 10^2 meters long, 31 meters wide. and 4.25 x 10^2 meters high, then the volume of the building would be 1409725 meters cube.

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

As given in the problem we have to calculate the volume of a large office building having the dimensions of  1.07 x 10 ^2 meters long,  31 meters wide, and 4.25 x 10^2 meters high.

The volume of the office building = length × width × height

                                                        =107 × 31 × 425

                                                        =140925 meters cube

Thus, the volume of the building would be 140925 meters cube.

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Answer:

1-There Must be some displacement in the direction of force.                                                  2-Angle between force and displacement is 0°.                                                                            

Answer:

false false false false

Answer:

288 grams

Explanation:

The amount of any radiative substance left after some time is calculated by

amount left = [tex]x/2^n[/tex]

where x is the initial amount of substance

n is the number of half lives

one half live is the time in which amount of substance reduce to half of its initial value.

------------------------------------------------------

amount left = 4.5 grams

half life of  iodine-125 = 60 days

total time in which substance reduced to 4.5 grams  = 360 days

thus,

number of half life in 60 days = 360/60 = 6

thus, there are period of 6 half lives

in each half life the amount of substance reduces to its previous half

let the initial amount be x grams

using the formula

amount left = [tex]x/2^n[/tex]

[tex]4.5 = x/2^6 \\ 4.5 = x/64\\x = 4.5*64 = 288[/tex]

Thus, 288 grams was the initial amount of iodine-125

Answer:

46.A 47.B 48.B 49.A.50.A.51.B.52.B

The answer of the questions  serially is  true, false,false ,true,true,false and false where blood is  a tissue which circulated by the pumping organ that is heart.

Heart is a muscular organ which is present in most of the animals , it is responsible for pumping blood via the blood vessels to the entire body.The blood which is pumped carries oxygen and nutrients along with it.Along with it on it's way back to heart it carries carbon dioxide to the lungs.

Heart has an approximate size of a closed fist and is present between the lungs in the middle compartment of the chest. It is divided in to for chambers , the upper chambers called atria and lower ones called ventricles.

The wall of the heart is made up of three layers : epicardium,myocardium and endocardium. It pumps blood with a rhythm which is determined by a group of cells which are called the pacemaker cells present in the sinoatrial node.

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Answer:

C. I

Explanation:

The elements are categorized in groups and periods. The periods are horizontal and the groups are vertical. The elements in the same group (vertical) have very similar characteristics.

Answer:

the internal force of attraction between the particle or molecules.

In solids the force is max.

In liquid it is intermediate.

And least in the gases..

Answer:

D

Explanation:

Move the decimal and count the places

Answer:

to make them more stable by filling up electrons

Answer:

Precambrian

Explanation:

Answer:

An Eon

Explanation:

epcohs are the shortest geologic time frame, which make up periods, that make up eras, that make up eons.

Answer:

If you increase the concentration of a reactant, there will be more of the chemical present. More reactant particles moving together allow more collisions to happen and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.

Answer:

730 mL which is .73 L

Explanation:

Answer:

No longer emitting heat or light, the white dwarf will become a black dwarf. Because it emits no radiation, it is nearly impossible to see. However, the black dwarf would still retain its mass, allowing scientists to detect the effects produced by its gravitational field.

Explanation:

Answer:

white dwarfs are hot, black dwarfs are cold

Explanation:

a white dwarf is a slowly burning and aging corpse of a main sequence star such as our sun. they are up to 40 times hotter then the sun, ranking among one of the hottest objects in the universe, except their luminosity is so low that all their heat stays in them basically forever.

On the other hand, a black dwarf is a theoretical ending to a white dwarf, over the course of trillions of years, white dwarfs cool down into black dwarfs. black dwarfs rank among the coldest possible temperature. We aren't sure if these are really a thing, because we still haven't given white dwarfs enough time to cool down.

Answer:

A B C D E

Explanation:

Answer:

B) Ca(H2PO4)2

Explanation:

To solve this we must be knowing each and every concept related to chemical formula.  Therefore, the correct option is option B among all the given options.

The chemical formula is indeed a means of expressing information about just the chemical proportion of atoms that comprise a certain chemical compound as well as molecule through the use of chemical element numbers and symbols.

Furthermore, the molecular formula does not contain any words and does not serve as a chemical name. However, it just indicates basic chemical structures and is not the same as the entire chemical structural formula.  The correct formula for calcium dihydrogen phosphate is Ca(H[tex]_2[/tex]PO[tex]_4[/tex])[tex]_2[/tex].

Therefore, the correct option is option B among all the given options.

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Answer:

1.cation

2.anion

Explanation:

the plus is always cation and the negative is anion

Answer:

1. cation

2. anion

Explanation:

A positive ion is always cation and the negative ion is anion