Question

If atomic number of an element is 15, the what is the position in periodic table in period and group number respectively​

Answer 1

The element having atomic number 20 is placed in the Group IIA and 4th period of the periodic table. The element is Calcium, Ca.

Answer 2

Answer:

The element with atomic number 15 belonging to group 15 is present in third period (Period-3). It has therefore, three shells. The element is Phosphorus (P), Configuration = 2, 8, 5, Valency = 5 or 3 (8-5=3) Nature = Non-metal.

Explanation: