How is the atomic mass of an element determined?

A. by adding the masses of the protons and electrons

B. by adding the masses of the neutrons and electrons

C. by determining the number of protons

D. by adding the masses of the protons, neutrons, and electrons

Answers

Answer 1

Answer:

D

Explanation:

Atomic mass is the total mass of protons, neutrons and electrons of an atom at rest


Related Questions

Tell electronic configuration of Copper? ​

Answers

Answer:

1s22s22p63s23p64s23d9

Explanatihe neutrlon:

Tell electronic configuration of Copper? ​

Copper is atomic # 29 so it has 29 protons.

The neutralatom must have 29 negative charges to balance the 29

positive charges, so it has 29 electrons.

Our electron configuration must account for all 29 electrons

Look at a Periodic Table

cture from

find copper #29

let us  "AUF-BAU"  ( buld up) the copper electronic configuration from the Periodic Table.copper #29 is in th 4th row.

To "build up", start at row 1.  this is the 1st energy level.  there are noly 2 elements H and He, so it is only an "s" robital. with 2 e's.  so

1s2ve 2 e's in an s orbital and 6 in p orbitals,

at row 2 (energy level 2) we have 2 e's in an s orbital and 6 in p orbitals, so

building on top of row 1, we have

1s22s22p6

at row 3 we repeat and so have

1s22s22p63s23p6

at row 4 we start with 2 e in an s orbital at the 4th energy level, so we

have

1s22s22p63s23p64s2

we now enter the d orbtals, and copper has 9 electrons in the d orbitals.  

but these d orbitals are only slightly at energy level 4.  because of their more complex shape, most of the orbital is in the 3rd energy level, so

we buld up for copper, #29

1s22s22p63s23p64s23d9

count the electrons and add them:

2 + 2 +6 +2 +6 +2 +9 = 29  copper's number

How does modern periodic table explain the cause of periodicity. ​

Answers

Answer:

The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals. For example, all the elements of group 1 i.e. alkali metals have a similar outer electronic configuration, ns1.

Can someone please help me with this

Answers

Answer:

Explanation:

cant see the screen really

Arrange the elements in order of increasing ionization energy. chlorine, fluorine, gallium, phosphorus

Answers

Answer:  Ga, P,Cl, F

Explanation:  

Cl 1314  kJ/mole

F 1681  kJ/mole

Ga 579  kJ/mole

P 1012  kJ/mole

What kind of mixture is a graham cracker?

Answers

Answer:

so here is the answer (What kind of a question my freind

Explanation:

Graham crackers are a whole wheat sweet cookie used in baking and making S'mores. Did you know that Graham crackers are called that because they're made from Graham Flour? It's a flour similar to conventional whole wheat flour in that both are made from the whole grain, but Graham flour is ground more coarsely.

The jewelers' mass unit for diamond is the
carat. By definition, 1 carat equals ex-
actly 200 mg.
What is the volume of a
1.07 carat diamond? The density of diamond
is 3.51 g/cm
Answer in units of cm".

Answers

Answer:

0.75 cm

Explanation:

You will convert 1.07 carat into mg then into g. You will multiply its reciprocal by 3.51g/cm to get the answer.

List nonscientific careers that use chemistry.

Answers

Non scientific careers are the careers that do not involve a person studying science courses or pursuing fields related to sciences.

Some of the nonscientific careers that use chemistry include:

Astrophysicist: An individual who studies the universe and its contents, such as the planets, stars etc. ProfessorSales: Those in the sales department may be involved in the use of chemicals.LawyerChefFarmer: A farmer can make use of chemicals such as herbicides, pesticides etc in controlling herbs and pests in his farm.Technical Writer: A writer may need to study and learn about a chemical or make use of it for his writing purpose.

Read related link on:

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what will happen to the atoms or sbstance when it is condenses​

Answers

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

Hope it helps!

Brainliest pls!

Follow me! :)

If empirical formula and molar mass of a compound is P2O5 and 142 respectively. the molecular formula of the compound will be....

Answers

Answer:

molecular formula = molar mass ÷ empirical formula

n = 142 ÷ 142

n = 1

molecular formula (P2O5)1 = P2O5

matter is not created or destroyed in any chemical or physical
a. law of conservation of mass
b. chemical change
c. physical change
d. wood

Answers

Answer: A
Trust me or don’t I just know it

Answer:

a

Explanation:

everything can be broken down to a smaller less useful compounds but never destroyed

What is a claim? (Please check all that apply)
An answer to a question that's asked.
A fact you're asserting is true.
Data from graphs and observations.
An explanation.

Answers

Answer:

Claim: It is an answer to your question

Explanation:

Calculate the no. of moles in 25gm of calcium phosphate

PLz Fast

Answers

answer/

1 grams Calcium Phosphate to mol = 0.00322 mol

no. of moles= 0.00322×25

no. of moles = 0.0805

What did the Copernican revolution demonstrate?
A. That science was limited to theories that could be tested
B. That science was a process of changing ideas
C. That science was only accurate when expensive equipment was
used
D. That science was not reliable and could not be trusted

Answers

Answer:

i think it's B.

Explanation:

write the chemical formula for the following compound -magnesium chloride, zinc sulphide Sodium,sodium sulphate, calcium bicarbonate.​

Answers

Answer:

magnesium chloride: MgCl2

zinc sulphide: ZnS

sodium sulphate: Na2SO4

calcium bicarbonate: Ca(HCO3)2

summarize why error is important.

Answers

Error is important because it helps you learn from your mistakes thats why we have errors

What is the density of water (in g/mL) to four significant figures at 20°C?

Answers

ANSWER:

I calculated it in g/cm^3, It equals 0.9982 g/cm^3

The density of water at 20°C is found to be 0.9982 g/mL.  

What is Density?

Density may be defined as the classical measurement of quantity or mass per unit of volume in a particular substance. According to mathematics, density is simply characterized as mass divided by volume. That is:

[tex]Density = \frac{Mass }{Volume }[/tex]

Density typically describes how much space an object or substance takes up in relation to the amount of matter in that object or substance.

Density only significantly depends on the mass of the body as well as the volume occupied by it. The SI unit of density is kg/[tex]m^3[/tex]. The density remarkably does not vary much with respect to the temperature.

Therefore, the density of water at 20°C is found to be 0.9982 g/mL.  

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What is a net ionic equation?

Answers

Answer :

a chemical equation in

which the electrolytes in aqueous

solution are expressed as dissociated

ions.

Have good day !!

what is the density of a rock with a volume of 5 mL and a mass of 13.5

0.37 g/mL

67.5 g/mL

2.7 g/mL

13.5 g/mL

Answers

Answer:

Density is 2.7 g/ml³

Explanation:

[tex]density = \frac{mass}{volume} \\ [/tex]

mass » 13.5 g

volume » 5 ml³

[tex]density = \frac{13.5}{5} \\ \\ = 2.7 \: {g \: ml}^{ - 3} [/tex]

Answer:

[tex]\boxed {\boxed {\sf 2.7 \ g/mL}}[/tex]

Explanation:

Density is a substance's mass per unit volume. The formula for calculating density is as follows.

[tex]\rho= \frac{m}{v}[/tex]

The mass of the rock is 13.5 grams and the volume of the rock is 5 milliliters.

m= 13.5 g v= 5 mL

Substitute these values into the formula.

[tex]\rho= \frac{13.5 \ g}{5 \ mL}[/tex]

Divide.

[tex]\rho= 2.7 \ g/mL[/tex]

The density of the rock is 2.7 grams per milliliter.

surely help:) I’ll brainlist!

Answers

Answer:

A. The product formed have more energy than the reactants.

This is because it is an endothermic reaction.

[tex].[/tex]

Which option is an isotope with 6 protons and 8 neutrons?

* oxygen-6
* oxygen-14
*carbon-14
*carbon-8

Answers

Answer:

carbon-14

Explanation:

becouse protons and neutrons are nagetivly charged

Why is large-scale nuclear fission a rare phenomenon on Earth?

Answers

Answer:

Large-scale nuclear is fission a rare phenomenon on Earth because

atoms that undergo fission aren't concentrated enough to sustain a chain reaction.

Hope it helps you.

Answer:

Atoms that undergo fission aren't concentrated enough to sustain a chain reaction. For example, the decay chain of U-238 is called the uranium series. ... Uranium is find in ores on Earth with very law mass percentage in it, so fission is not possible

The formula F= 9/5C + 32
changes a temperature reading from the Celsius scale C to the Fahrenheit scale F. What is the temperature measured in degrees Fahrenheit when the Celsius temperature is 10 (DEGREES) C​?

Answers

Answer:

yes it is c=mxb okay

Explanation:

Jane and Jack have a bicycling competition Jane rides a constant speed of 12 miles per hour while Jack rides at a constant speed of 330 feet per minute. How fast are Jane and Jack going in meters per second? Who finishes first? Show your factor-label method work. There are 5280 feet in one mile. There are 3.281 feet in one meter

Answers

Answer:

Explanation:

I don't know how you want the conversion done. I use dimensional analysis.

Jane

12 miles / hour [1.6 km/1 mile][1000 m/1 km][1 hour / 3600 sec]

12 * [1.6 * 3600 / 1000  m/s] = 69.12 m/s

5.33 m/s      This answer is a bit shorter than using 5280 feet.

Using 5280 feet

12 miles / hour [5280 ft/1 mile] [1 m/3.281 feet] * [1 hr/3600 sec]

12 * 5280 / (3.281 * 3600)

12 *. 4470

5.36

Jack

330 feet / minute [ 1 meter / 3.281 feet] [1 minute / 60 seconds]

330 * 1/(3.281 * 60)

330 * 1/(196.86)

1.676 m/s

She's going faster than he is, no matter which method is used to do the calculation

Decomposition of bark of bracket fungi

a
Chemical Change
b
Physical Change

Answers

Answer:

Both.

Explanation:

In decomposition, two processes occur. Firstly, because of chemical change the colour of the top layer is transformed. And secondly, due to first reaction it turns into bark and it's a physical change.

So both the changes are the part of decomposition reaction.

The decomposition of the bark of fungi is a chemical change. So the correct option is A.

What is decomposition?

The word decomposition literally means “to break down”. The process usually relates to the disintegration of the complex organic matter into a simpler inorganic matter. It is a very significant and essential process of the ecosystem.

Hence, decomposition is a metabolic process, performed by living organisms. They take up raw materials in the form of complex compounds, turn process and then convert it into simpler compounds.

Bacteria, fungi, and a few other microorganisms are known as decomposers and they can initiate the process of decomposition. They survive on dead organisms by feeding on them.

The dead and decaying animals and plants are able to serve as raw materials. Upon their breakdown, they produce nutrients, carbon dioxide, water, etc. Dead animals, plants, and their remains are called detritus. This detritus is used by plants and are collectively known as saprophytes.

Therefore, the correct option is A.

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what is the volume of a substance with a mass of 64.9 g/ and a density of 2.1 g/ml?

Answers

It’s 34 I had this question

4. List three (3) safety rules when using a Bunsen burner.
1.
2.
3.

Answers

Answer:

  1. place the bunsen burner away from any overhead shelving, equipment or lights by at least 1 foot.

2.  remove all un-needed supplies and excess chemicals from the area.

3. tie-back any long hair, take off loose jewlery, or change out of loose clothing.

An element cannot ________. a be part of a homogeneous mixture b be a pure substance c interact with other elements to form compounds d be part of a heterogeneous mixture e be separated into other substances by chemical means

Answers

Answer:

b be a pure substance

Explanation:

HELP! Fill in the blanks:
The net charge of an atom is equal to the difference between the_____
in the atom's nucleus and the_____

Answers

Answer:

I don't know

Explanation:

is today your test

1. If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

2. The nucleus of an atom is the atom's dense and heavy core with a positive charge




I’m not so sure about the second one but I hope I helped :)

4.4 x 10^-9
What’s this in standard form or scientific notation

Answers

Answer:

How to Convert a Number to Standard Form

Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. ...

Count how many places you moved the decimal point. ...

Write your scientific notation number as a x 10b and read it as "a times 10 to the power of b."

Explanation:

26,470 centimeters to meters

Answers

264.7 metres i know that there are 100 cm in a meter so i divided the amount of cm by 100

Answer:

264.7

Explanation:

26470 cm = 264.7 m

just move the decimal over two spaces.

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