IGCSE Chemistry 0620/21/O/N/21 Q21

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21 A period of the Periodic Table is shown.

group      I   II   III  IV  V  VI  VII  VIII
element R    S    T   V   W   X    Y     Z

The letters are not their chemical symbols.
Which statement is correct?

A Element R does not conduct electricity.
B Elements R and Y react together to form an ionic compound.
C Element Z exists as a diatomic molecule.
D Element Z reacts with element T.

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Answer ( 1 )

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    2022-05-11T21:38:09+08:00

    A. Element R conducts electricity because element R is in Group I and Group I elements are alkali metals and they conduct electricity.

    B. Elements R and Y can form an ionic compound because elements of Group I and Group VII can form ionic bonds, the chemical formula of the compound is RY.

    C. Element Z is situated in Group VIII. Elements of Group VIII are monoatomic and their atoms are noble gases, they do not react with other elements.

    D. Element Z is situated in Group VIII. Atoms of Group VIII elements are noble gases, they do not react with atoms of other elements.

    Ans: B

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