Question

Six elements A, B, C, D, E and F have the following atomic numbers (A = 12, B = 17, C = 18, D = 7, and F = 11).
Among these elements, the element, which belongs to the 2nd period
is ____.
 F
 D
 C
 B​

Answer 1

Answer:

the question answer is c

Answer 2

Answer:

D = 7

Explanation:

as second period consists of

elements of atomic number 3 to 10.