Question

(i) Draw the atomic structures of the following elements: Magnesium, silicon, sulphur.

(ii) What is the atomic number and mass number of the element whose atomic structure is shown in below?

Answer 1

(i) Magnesium: Symbol = Mg

Atomic number = 12 

Protons = 12 

Electrons = 12 

Electronic configuration = 2, 8, 2 

Atomic structure:

Silicon: Symbol = Si

Atomic number = 14 

Protons = 14 

Electrons = 14 

Electronic configuration = 2, 8, 4 

Atomic structure:

Sulphur: Symbol = S 

Atomic number = 16 

Protons = 16 

Electrons = 16 

Electronic configuration = 2, 8, 6 

Atomic structure:

(ii)

Atomic number that can be determined from the atomic structure is 13 

Mass number is 13 + 14 = 27