Question

Write down the characteristics of the elements having atomic number 17.
Electronic configuration ____________________________________
Period number ____________________________________
Group number ____________________________________
Element family ____________________________________
No. of valence electrons ____________________________________
Valency ____________________________________
Metal or non-metal ____________________________________.

Answer 1

Chlorine has atomic number 17.

Electronic Configuration- 1s${}^2$ 2s${}^2$ 2p${}^6$ 3s${}^2$ 3p${}^5$.

Period Number-3

Group number- VII (A) or 17

Element Family- Halogens

No. of valence electrons- 7

Valency- 1

Metal/ Non-metal- Non-metal.