Question

1. which elements had complete outer shells? either two or eight electrons in their outer most shell. give the name and (symbol) for each.

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

Explanation:

Elements with complete outer shells are noble gases (except helium which has 2 outer - shell electrons). Helium has 2 electrons in its outer shell (first shell), and neon, argon, krypton, xenon, and radon have 8 electrons in their outer shells.

Answer:

a. Helium (He)
b. Neon (Ne)
c. Argon (Ar)