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14 June, 12:41

Calcium has an atomic number of 20 and 2 valence electrons. Oxygen has an atomic number of 8 and 6 valence electrons. Neon has an atomic number of 10 and 8 valence electrons. Explain how the placement of these three elements on the periodic table compares and why they are placed where they are relative to each other.

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  1. 14 June, 13:02
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    Calcium is in group 2 period 4 of periodic table

    Oxygen is in group 16 and period 2

    neon is in period 2 and group 16.

    Explanation:

    Valence electron in calcium = 2

    valence electron in oxygen = 6

    valence electron in neon = 8 valence electron.

    Calcium is placed in s block group 2 of period 4.

    oxygen is placed in period 2 and group 16

    Neon is a p block element, placed in period 2 and group 16.

    Calcium is a elecropositive element which can share or donates its electrons to for compound, it has oxidation state of + 2 and hence placed in group 2

    Oxygen is electronegative as it can accept or share 2 electrons to form a bond. It has oxidation of - 2.

    Example is CaO.

    Neon has its outer shell complete it is an inert element which will not share or donate electrons. it has oxidation state of 0
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