Chemistry, 10.09.2019 21:10 imthebestatcod

What do helium (he), neon (ne), and argon (ar) have in common?
a. they have the same number of electron energy shells.
b. they are all halogens.
c. they have the same number of electrons.
d. they are all noble gases.

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What do helium (he), neon (ne), and argon (ar) have in common?
a. they have the same number...