Which elements contains $5$ electrons in the outermost shell?

An element has 5 electrons in its M-shell, which is the outermost shell, and write the electronic configuration of the element.

Name

(a) three elements that have a single electron in their outermost shells.

(b) two elements that have two electrons in their outermost shells.

(c) three elements with filled outermost shells.

Name two elements each one of which has two electrons in its outermost shell.