Answers

2015-04-30T20:56:50+05:30
The outer most electrons of these elements are enters into 's' orbital only and these elements have only one electron in their outermost orbital.
Hydrogen: 1s1
Lithium: 1s2 2s1
Potassium: 1s2 2s2 2p6 3s2 3p6 4s1
2 5 2