1. What is the basic unit of matter and is considered as the smallest unit

of an element?

A. Atom

B. Electron

C. Neutron

D. Proton

For Numbers 2 and 3, refer to the following illustration/drawing below.

2. Which part is a negatively charged particle?

A. Part A

B. Part B

C. Part C

D. Part A and Part B

3. Which part would determine the mass of an atom and is collectively

known as nucleus?

A. A only

B. A and B

C. B and C

D. C only

4. What are the three subatomic particles?

A. Proton, Neutron, and Hydrogen

B. Nucleus, Proton, and Neutron

C. Proton, Neutron, Electron

D. Proton, Ion, and Electron5. Who developed the Atomic Theory of matter?

A. Antoine Lavoisier

B. John Dalton

C. Ernest Rutherford

D. Joseph Proust

6. Which statement about subatomic particles is TRUE?

A. Protons, Electrons, and Neutrons all have the same mass

B. An electron has less mass than either a proton or neutron

C. Unlike protons or neutrons, electrons have no mass

D. Neutrons have no charge and no mass

7. The mass number of the atom can be obtained by .

A. Adding the protons and the electrons

B. Adding the electrons and neutrons

C. Determining the number of protons only

D. Adding the number of protons and neutrons

8. The atomic number of an element is equal to .

A. The number of protons in an atom

B. The number of neutrons in an atom

C. The number of protons plus the number of electrons in the atom

D. The number of protons plus the number of neutrons in the atom

9. To determine the number of neutrons in the nucleus of a neutral atom,

you have to subtract .

A. Its mass number from its atomic number

B. Its atomic number from its mass number

C. Its mass number from its electron number

D. Its atomic number by its electron number

10. The identity of an element is determined by .

A. The number of its protons

B. The number of its neutrons

C. Its atomic mass

D. The number of its electrons

11. Which of the three subatomic particles have the least contribution to

the overall mass of an atom?

A. Proton

B. Neutron

C. Electron

D. Nucleus
12. Hydrogen has an atomic number of 1 and a mass number of 1. Which

is NOT true about hydrogen?

A. It has 1 proton

B. It has 1 electron

C. It has 1 neutron

D. It is electrically neutral

13. The element oxygen (O) has an atomic number of 8. How many number

of protons are there in an oxygen atom?

A. 8

B. 16

C. 32

D. 64

14. The element Neon (Ne) has an atomic number of 10. How many number

of Electrons are in a Neon atom?

A. 0

B. 5

C. 10

D. 15

15. The element Calcium has a mass number of 40 and an atomic number

of 20. What is its number of Neutron?

A. 5

B. 10

C. 15

D. 20​