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7 July, 03:04

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

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  1. 7 July, 06:28
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    The Group number and period number corresponds to the outer most shell and number of electrons present in outer most shell.

    For Example:

    Oxygen has atomic number 8, and its electronic configurations is,

    1s², 2s², 2pₓ², 2py¹, 2pz¹

    The outermost shell is 2, means oxygen is present in period 2, and the number of electrons in n = 2 are 6, so the group number is 6 in periodic table.

    Lets take another example of Sodium, it has atomic number 11 with electronic configuration;

    1s², 2s², 2p⁶, 3s¹

    The outermost shell is 3, means sodium is present in period 3, and the number of electrons in n = 3 are 1, so the group number is 1 in periodic table.
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