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20 March, 15:11

What is the criteria to place an element in a particular group?

and the criteria to place a period?

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  1. 20 March, 15:40
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    Answer: The criteria to place elements into groups and periods lies in their atomic number

    Explanation:

    As we know that period is the horizontal rows of elements in the periodic table and groups are vertical column of elements in the periodic table.

    In a period we place those elements that have same number of shells and in a group those elements are placed that have different number of shells and the number of shells increases from top to bottom in a periodic table

    For example

    Sodium having symbol Na, atomic number of sodium is eleven it's electronic configuration is 1s2,2s2,2p6,3s1, next to it in a period is places potassium having symbol, K, it's electronic configuration is 1s2,2s2,2p6,3s2.

    Sodium and potassium both r placed in a period not in a group because both of these have same outer most shell, only the number of electron in outer most shell varies.
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