What is the shorthand electron configuration for As?

1 Answer
Jan 15, 2017

The configuration may be written as: #1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^3#


Each whole number refers to the energy shell in which the electrons are located. The letters #s, p, d, f# refer to orbitals within each energy shell where electrons are very likely to be located. Each orbital can hold up to a maximum number of electrons ( the #s# orbital 2, the #p# orbital 6 ... and so on). If you add up the number of electrons ( 33 in this case) the total equals the number of protons in the nucleus, and is also the atomic number for that element.