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Answer 1 · 2016-01-04T00:37:50

The number of valence electrons would be 5.

Arsenic is Group 15 so you can subtract 10 and you would get your number of valence electrons. (This only works on group 13 and above).

Answer 2 · 2016-01-04T00:38:51

Arsenic (As) is in the 4th Period. It has 5 valence electrons in the outermost energy level.

The electron configuration for As is ...

#[Ar]4s^2# #3d^10# #4p^3#

The outermost shell is #4s^2# #4p^3# which has 5 valence electrons .

Hope that helped