Question

The total number of elements in period 3 of the periodic table is

• A. 2
• B. 8
• C. 18
• D. 32

Answer 1

The correct option is B

8

Periods are horizontal rows. There are 7 periods.

Explanation for the correct answer:

The period 3 elements include Sodium ($\mathrm{Na}$), Magnesium ($\mathrm{Mg}$), Aluminium ($\mathrm{Al}$), Silicon ($\mathrm{Si}$), Phosphorous ($\mathrm{P}$), Sulphur ($\mathrm{S}$), Chlorine ($\mathrm{Cl}$) and Argon ($\mathrm{Ar}$). There are 8 elements in period 3.

Explanation for the incorrect answer:

The period 1 contains 2 elements.

The period 4 contains 18 elements.

The period 6 contains 32 elements.

Final answer:

Hence, option (B) is the correct option.