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Helium is placed in group 18 on the periodic table because A. it has a full outer shell of electrons. B. it is highly reactive. C. it is a metal. D. it has a valence of eight THE ANSWER IS it has a full
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Helium is placed in group 18 on the periodic table because

A.
it has a full outer shell of electrons.
B.
it is highly reactive.
C.
it is a metal.
D.
it has a valence of eight

THE ANSWER IS
it has a full outer shell of electrons.

User Nzc
by
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2 Answers

10 votes
Answer : A
Explanation: The reason of keeping helium in group 18 is that it shows properties similar to noble gases. it is because of its completely filled outer shell which gives it noble gas properties(i.e. it doesnt form compounds,etc).
User Jeanmichel
by
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8 votes

Answer:

A

Step-by-step explanation:

You already said the answer sooo

User Cristian Meneses
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