Helium,He,is a Nonmetallic Gas and the Second Element in the Periodic

question 60

Multiple Choice

Helium,He,is a nonmetallic gas and the second element in the periodic table.Rather than being placed adjacent to hydrogen,H,however,helium is placed on the far right of the table because

• A)hydrogen and helium repel one another.
• B)the sizes of their atoms are vastly different.
• C)they come from different sources.
• D)helium is most similar to other group 18 elements.

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