Question

The number of elements and no. of shells in third period is respectively
A. 18, 3
B. 8, 3
C. 18, 4
D. 8, 2

Answer 1

Answer:

option (c) 8,3 is the answer

Answer 2

B. 8, 3

Explanation:

Option B is the answer.

The number of elements in period 3 of the periodic table is eight.

The number of shells in period 3 can be observed from the electronic configuration of the period 3 elements like sodium, magnesium, etc. They have 3 shells as the first shell can hold 2 electrons and the second shell can hold 8 electrons and the third shell can hold 8 electrons. The third shell is partially filled for the period 3 elements.