When full the innermost electron shell of an atom contains electrons and the outemost shell contains electrons?

Answer 1

18Argon2, 8, 818

http://en.wikipedia.org/wiki/Electron_shell

Answer 2

When full, the innermost electron shell of an atom contains 2 electrons, and the outermost shell contains 8 electrons. This is known as the octet rule, where atoms tend to gain, lose, or share electrons in order to achieve a full outer shell of 8 electrons.

Answer 3

2 and 8, respectively