Questions with help 2

Quick revise

Give the electronic configuration (electron arrangement) for these ions:

(as an example, an atom of sodium has 11 electrons and so it would be 2,8,1 . The Na+ ion must have one less electron since the ion is one-positive. Consequently, the electronic configuration is 2,8,0)

K+ (atomic number = 19)

F- (atomic number = 9)

O2- (atomic number = 8)