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JEE Main levelOne or more correct optionsDifficulty 2 of 3pt052

Select the correct statement(s) about the long form of the periodic table.

AThe s-block contains groups 1 and 2.
BThe p-block contains groups 13 to 18.
CThe d-block contains groups 3 to 12.
DAll group 18 elements have the valence configuration $n s^{2} n p^{6}$ .

Answer: A, B, C

The s-, p- and d-blocks span groups 1-2, 13-18 and 3-12 respectively, so A, B and C are true. Helium is

1 s^{2}

and has no p electrons, so D is false.

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