What is the electron configuration of Be plus 2?

1s^22s^2

Or

[He]2s^2

First, look how many electrons are present. This is indicated by the atomic number located in the Periodic Table above the specific element. Secondly, use the list of orbitals to remember the order:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s.

S=2 electrons

P=6 electrons

D=10 electrons

ex: The element Boron (B)= 1s^2 2s^2 2p^1. You are looking at the (^2, ^2, ^1). Which adds to five, the total number of electrons in a neutral Bromine element.

(There is an f, but it is rarely used)

Hope that helps!