IGCSE Chemistry 0620/21/O/N/21 Q24

Question

24 The noble gases are in Group VIII of the Periodic Table.

Which statement explains why noble gases are unreactive?

A They all have eight electrons in their outer shells.
B They all have full outer shells.
C They are all gases.
D They are all monoatomic.

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Answer ( 1 )

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    2022-05-11T22:02:51+08:00

    A. They do not all have 8 electrons (octet) at their outermost shell. Helium (He) has 2 electrons (duplet) at its outermost shell and it is also located in Group VIII.

    B. They all have full outermost shells.

    C. It is true that they are all gas, but this does not explain why they are unreactive.

    D. It is true that they are monoatomic, but this does not explain why they are unreactive.

    Ans: B

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