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

(a) Lithium (Li), Sodium (Na) and potassium (k) have one electron in their outermost shells.
(b) Magnesium (Mg) and Calcium (Ca) have two electrons in their outermost shells.
(c) Neon (Ne), Argon ( Ar ) and Xenon ( Xe ) have 8 electrons means filled the outermost shells.