Question

To which period does this magnesium belong

Answer 1

magnesium belongs to the third period.
MAGNESIUM
atomic number:12
electronic configuration:1s²2s²2p⁶3s²
atomic mass: 24 g
valency :+2
group number: IIA
period number:3

Answer 2

mg belongs to 2nd period as it has 2 outer most electrons and 3rd period becausethe valance electrons comes in the third  shell the group is known as alkaline earth metals to which mg belongs