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15 November, 04:04

what is the difference between the number of electrons in an atom selenium and the number of electrons in an atom of aluminum

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  1. 15 November, 04:14
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    There are 13 electrons in atom of aluminium and 34 in atom of selenium.

    Explanation:

    Aluminium:

    It is present in group 13.

    It has three valance electrons.

    It form cation.

    Its electronic configuration is:

    Al = [Ne] 3s² 3p¹

    The electron in 3s and 3p are considered as valance electrons of aluminium.

    Aluminium atom has 13 protons and 14 neutrons thus its mass number is 27 amu.

    Selenium:

    It is present in group 16.

    It has six valance electrons.

    It form anion.

    Its electronic configuration is:

    Se = [Ar] 3d¹⁰ 4s² 4p⁴

    The electron in 4s and 4p are considered as valance electrons of selenium.

    Selenium atom has 34 protons and 45 neutrons thus its mass number is 79 amu.
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