Noble Gas Configuration

Question 1

how can a short hand electron configuration be found?

Answer 1

by using the electron configuration of noble gases which is above the desired element

Question 2

which electrons take part in a reaction?

Answer 2

the outer shell electrons

Question 3

what are the 2 exceptions in electron configuration ?

and what do these examples show ?

Answer 3

Chromium and Copper

these examples either show a full or half full sub shell

these structures are of lower energy and more stable arrangements