Quiz about The Atom

Question 1

Which subatomic particle has a positive charge?

Accepted Answer

Proton

Answer

Electron

Answer

Neutron

Answer

Photon

Question 2

In a neutral atom, the number of protons equals the number:

Accepted Answer

Electrons

Answer

Neutrons

Answer

Isotopes

Answer

Nucleons

Question 3

Which of the following subatomic particles has the least mass?

Accepted Answer

Electron

Answer

Proton

Answer

Neutron

Answer

Alpha particle

Question 4

The energy levels in the Bohr model are:

Accepted Answer

Discrete

Answer

Continuous

Answer

Variable

Answer

Infinite

Question 5

In the Bohr model, the electron's energy increases as it moves:

Accepted Answer

Further from the nucleus

Answer

Closer to the nucleus

Answer

In a circular path

Answer

Randomly

Question 6

Which subatomic particle has a negative charge?

Accepted Answer

Electron

Answer

Neutron

Answer

Proton

Answer

Photon

Question 7

What does the Bohr model primarily explain?

Accepted Answer

Electron configuration

Answer

Chemical bonding

Answer

Nuclear reactions

Answer

Light emission from atoms

Question 8

What is the mass number of an atom?

Accepted Answer

Total protons and neutrons

Answer

Total protons

Answer

Total neutrons

Answer

Total electrons

Question 9

The atomic number of an element is determined by the number of:

Accepted Answer

Protons

Answer

Neutrons

Answer

Electrons

Answer

Isotopes

Question 10

Smallest mass of the 3 subatomic particles:

Accepted Answer

Electrons

Answer

Protons

Answer

Neutrons

Question 11

Isotopes of an element differ in their:

Accepted Answer

Number of neutrons

Answer

Number of protons

Answer

Number of electrons

Answer

Atomic mass

Question 12

If an atom has 18 protons and 22 neutrons, what is its mass number?

Accepted Answer

40

Answer

4

Answer

26

Answer

30

Question 13

Which of the following is NOT a characteristic of isotopes?

Accepted Answer

They have the same number of neutrons.

Answer

They can be stable or radioactive.

Answer

They have the same chemical properties.

Answer

They have different atomic masses.

Question 14

What happens to an electron when it absorbs energy in the Bohr model?

Accepted Answer

It moves to a higher energy level

Answer

It is ejected from the atom

Answer

It moves to a lower energy level

Answer

It remains in the same energy level

Question 15

Which of the following elements has the same number of electrons as the isotope Oxygen-16

Accepted Answer

Oxygen-18

Answer

Boron-11

Answer

Carbon-14

Answer

Nitrogen-15

Question 16

What happens to an electron when it emits energy in the Bohr model?

Accepted Answer

It moves to a lower energy level

Answer

It moves to a higher energy level

Answer

It is ejected from the atom

Answer

It remains in the same energy level

Question 17

How many neutrons are present in the isotope Uranium-238?

Accepted Answer

146

Answer

238

Answer

92

Answer

0

Question 18

Which of the following pairs represents isotopes of the same element?

Accepted Answer

Carbon-12 and Carbon-14

Answer

Oxygen-16 and Nitrogen-16

Answer

Hydrogen-1 and Helium-2

Answer

Sodium-23 and Potassium-39

Question 19

An atom has 14 protons and 12 neutrons, how many electrons does the atom have?

Accepted Answer

14

Answer

26

Answer

2

Answer

8

Question 20

If an electron in a hydrogen atom absorbs energy and moves to a higher energy level, what is this process called?

Accepted Answer

Excitation

Answer

Absorption

Answer

Emission

Answer

Ionization

Question 21

Which subatomic particle has no charge?

Accepted Answer

Neutron

Answer

Positron

Answer

Electron

Answer

Proton

Question 22

Nitrogen has two isotopes, N-14 with an abundance of 99.63% and N-15 with an abundance of abundance of 0.37%. How would you find the average atomic mass?

Accepted Answer

Multiply the abundance of N-14 by its mass and the abundance of N-15 by its mass, then add the two contributions.

Answer

Multiply the abundance of N-14 by its mass and the abundance of N-15 by its mass, then subtract the two contributions.

Answer

Add the masses of N-14 and N-15 together, then divide by the total abundance.

Answer

Take the average of the two masses without considering their abundances.

Question 23

How would you find the number of neutrons in an atom?

Accepted Answer

Round the atomic mass number and subtract the atomic number.

Answer

Round the atomic mass and add it to the atomic number.

Answer

Add the protons and electrons.

Answer

Subtract the electrons from the protons.

Question 24

An atom of carbon-14 has:

Accepted Answer

6 protons and 8 neutrons

Answer

6 protons and 6 neutrons

Answer

14 protons and 6 neutrons

Answer

8 protons and 6 neutrons

Question 25

How many protons in Sulfur-32?

Accepted Answer

16

Answer

32

Answer

12

Answer

20

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