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1 May, 04:39

In which grouping of the periodic table do the elements have similar properties?

only columns

both rows and columns

only rows

in the periods

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Answers (1)
  1. 1 May, 05:08
    0
    only columns

    Explanation:

    All atoms of elements present in same group or column having same number of valance electrons. Thus the elements in same group having same properties.

    For example:

    Consider the second group. It consist of alkaline earth metals. There are six elements in second group. Beryllium, magnesium, calcium, strontium, barium and radium.

    All have two valance electrons.

    Electronic configuration of Beryllium:

    Be = [He] 2s²

    Electronic configuration of magnesium.

    Mg = [Ne] 3s²

    Electronic configuration of calcium.

    Ca = [Ar] 4s²

    Electronic configuration of strontium.

    Sr = [Kr] 5s²

    Electronic configuration of barium.

    Ba = [Xe] 6s²

    Electronic configuration of radium.

    Ra = [ Rn] 7s²

    They are present in group two and have same number of valance electrons (two valance electrons) and show similar reactivity.

    They react with oxygen and form oxide.

    2Ba + O₂ → 2BaO

    2Mg + O₂ → 2MgO

    2Ca + O₂ → 2CaO

    this oxide form hydroxide when react with water,

    BaO + H₂O → Ba (OH) ₂

    MgO + H₂O → Mg (OH) ₂

    CaO + H₂O → Ca (OH) ₂

    With sulfur,

    Mg + S → MgS

    Ca + S → CaS

    Ba + S → BaS
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