Question

How many valence electrons does Arsenic have?

Answer 1

Arsenic has 5 valence electrons.

It's electron configuration is `1s^2` `2s^2` `2p^6` `3s^2` `3p^6` `3d^10` `4s^2` `4p^3`. It's outermost shell (4s and 4p) has 5 electrons, these are the valence electrons.