Question: how many electrons are on the outer shell of group 1?
Answer: All the Group 1 elements - lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and francium (Fr) - have one electron in the outer shell. The Group 7 elements - fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At) - have seven electrons in the outer shell.