The chemical symbol is As. The atomic number is 33.
[Ar]4s23d104p3
It is As.
[Kr] 5s1
Arsenic [Ar]4s23d104p3
[Ar]3d104s24p3
No. Arsenic isn't a gas at all, at least not unless you're willing to heat it to 887 degrees Kelvin.
[Kr] 4d10 5s2 5p3
[Kr] 5s1
Arsenic [Ar]4s23d104p3
[Ar]3d104s24p3
[Ne]3s23p3
[Ar]3d104s24p3
No. Arsenic isn't a gas at all, at least not unless you're willing to heat it to 887 degrees Kelvin.
[Kr] 4d10 5s2 5p3
[He] 2s2 2p1
2.3!<-----wrong shorthand electron configuration for Boron (B on the periodic table) is [He] 2s2 2p1 because Shorthand means building on the last noble gas element. So put the closest Noble gas element before this one and then the new addition.
[Xe] 4f14 5d2 6s2
[Xe] 4f14 5d10 6s2 6p2
(Xe)6s24f145d4