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22 October, 02:35

What is the period number in which helium is found? What is the group name in which helium is found?

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Answers (2)
  1. 22 October, 05:15
    0
    Period no. = 1, Group no. = 18

    Explanation:

    Atomic number of He = 2

    Helium is placed in period 1 and group 18.

    Helium is an inert gas and also known noble gas.

    Helium is the first element placed in group 18.

    Helium is a colourless, odder-less gas. Its outer shell (K shell) is fully occupied and so has inert gas configuration.

    Because of inter gas configuration, it is chemically inactive.
  2. 22 October, 05:22
    0
    Helium is found in the 1st period of the periodic table. It also is part of the noble gases group in the last column (18th) of the table.
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