l. Direction: Solve what is being asked in the following number.

1. How many electron does the element Argon contain if its mass number 40 and its proton is 18?
A. 18
B. 20
C. 30
D. 36

2. How many neuron does the magnesium contain if its mass number 24 and its atomic number is 12?
A. 24
B. 12
C. 36
D. 30

3. If the element Chlorine has an atomic number of 17 and its number of electron is 17, what is its number of proton?
A. 17
B. 34
C. 0
D. 30

4. What is the atomic number of the Oxygen if its mass number is 16 and its neutron is 8?
A. 16
B. 8
C. 10
D. 24

5. What is the mass number of the element Tin it its atomic number is 50 and its Neutron is 69?
A. 119
B. 50
C. 69
D. 19​