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10 March, 02:52

As the elements in period 3 are considered in order from sodium to chlorine, there is an increase in the

1) atomic radius

2) electronegativity

3) number of electrons in the first shell

4) number of electron shells

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Answers (1)
  1. 10 March, 06:44
    0
    2 Electronegativity

    Explanation:

    Period 3 on the element table contains the following eight elements

    Element Symbol Atomic number Atomic radius / nm

    sodium Na 11 0.191

    magnesium Mg 12 0.160

    aluminium Al 13 0.130

    silicon Si 14 0.118

    phosphorus P 15 0.110

    sulfur S 16 0.102

    chlorine Cl 17 0.099

    argon Ar 18 0.095

    Sodium and magnesium, are members of the s-block of the periodic table

    The rest are members of the p-block.

    In the whole of period 3, the outer electrons are all in 3-level orbitals

    Na [Ne] 3s1

    Mg [Ne] 3s2

    Al [Ne] 3s2 3px1

    Si [Ne] 3s2 3px1 3py1

    P [Ne] 3s2 3px1 3py1 3pz1

    S [Ne] 3s2 3px2 3py1 3pz1

    Cl [Ne] 3s2 3px2 3py2 3pz1

    Ar [Ne] 3s2 3px2 3py2 3pz2

    1) No

    2) Yes

    3) No

    4) No
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