Question

Question #796c2

Answer 1

Refer to the periodic table.

Explanation:

Each column (which chemists call 'group') will have elements having the same valency. They have the same number of electrons in their outermost shell.

Some examples of common elements with `n` valence electrons

`n = 1` - Li, Na, K
`n = 2` - Be, Mg, Ca
`n = 3` - B, Al
`n = 4` - C, Si
`n = 5` - N, P
`n = 6` - O, Si
`n = 7` - F, Cl, Br, I
`n = 8` - He, Ne, Ar