How many atomic orbitals are there in an s subshell?
The s orbital holds one subshell which is capable of housing two electrons.
The Alkali Metals is the first column and have an electron valence shell of
Lithium - Li
Sodium - Na
Potassium - K
The Alkaline Earth Metals is the 2nd column and have an electron valence shell of
Beryllium - Be
Magnesium - Mg
Calcium - Ca
I hope this was helpful.