Question

1. which elements had only one electron in their outer most shell?

a. __________ (____)
b. __________ (____)
c. __________ (____)

Explanation:

Elements in Group 1 of the periodic table have one electron in their outermost shell. This is due to their electron - configuration patterns.

Answer:

a. Hydrogen (H)
b. Lithium (Li)
c. Sodium (Na)