3. Name (a) Three elements that have a single electron in their outermost shells. (b) Two elements t

3. 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

Solution:

1. Lithium (Li), Sodium (Na) and potassium (k) have a single electron in their outermost shells.

2. Magnesium (Mg) and Calcium (Ca) have two electrons in their outermost shells

3. Neon (Ne), Argon (Ar and Xenon (Xe) filled outermost shells