Calcium is more prone to lending electrons than borrowing them. It can lend a total of two electrons.
Aluminium lends it's eletrons, it does not borrow it.
Metals Borrow electrons, NOT Lend. Nonmetals are the ones that Lend.
Nitrogen has 5 valence electrons, if that's what you're asking, but it's unlikely for a nonmetal to lend electrons so much as it shares with another nonmetal.
Helium is a noble gas, so it's unlikely to bond with any other element. It has 2 valence electrons, but it cannot give and it's not likely to receive.