Question

write the period and group numbers of elements with atomic number 15

Answer 1

Answer:

Phosphorous is element number 15. It is located in period 3 and group 15.

Answer 2

Answer:

period: 3

group: 15

Explanation:

configuration(z=15) =(1s^2,2s^2,2p^6,3s^2,3p^3)

since valence shell is 3 so this element is presend in period 3

and no. of electron to complete octrct are 5 so the element lies in group no. is 15(10+5)