question_answer 10)

                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.   

Answer:

(a) (i) Lithium (ii) Sodium (iii) Potassium (b) (i) Beryllium (ii) Magnesium                        (c) (i) Helium (ii) Neon (iii) Argon.