ASSESSMENT #3

(SUBATOMIC PARTICLES)

Directions: Choose the letter of the correct answer. Write your answers on a separate sheet of paper.

1. Which is a subatomic particle?

A. atom

C. molecule

B. electron

D. nucleus

2. Which subatomic particles are inside the nucleus of an atom?

A. proton and neutron

C. proton and electron

B. electron and neutron

D. electron and nucleus

3. It tells the identity of an element and is equal to the number of protons.

A. atomic mass

C. both A and B

B. atomic number

D. none of these

4. What is the atomic number of Magnesium (Mg)?

A. 12

C. 36

B. 24

D. 38

5. What is the number of neutron of Mg?

A. 12

C. 36

B. 24

D. 48

6. What is the number of electron of Mg? A. 12

C. 36

B. 24

D. 50

7. To compute for the number of neutron of an element, ___________.

A. add the atomic number from the atomic mass.

B. divide the atomic mass from the atomic number.

C. multiply the atomic number from the atomic mass.

D. subtract the atomic number from the atomic mass.

8.Which two subatomic particles are the same with atomic number?

A. proton and neutron

C. neutron and electron

B. electron and proton

D. nucleus and neutron

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