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What is the valency of magnesium with at...

What is the valency of magnesium with atomic number 12 and sulphur with atomic number 16?

Text Solution

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(i) Atomic number of magnesium = 12
Electronic configuration is 2, 8, 2.
A magnesium atom can lose its 2 valence electrons to achieve the inert gas electronic configuration of neon (2,8).
Therefore, valency of magnesium = 2.
(ii) The atomic number of sulphur = 16.
Electronic configuration = 2, 8, 6.
A sulphur atom cannot lose 6 electrons to achieve inert gas electronic configuration due to energy consideration. It can gain 2 electrons to achieve the nearest inert gas electronic configuration of argon (2, 8, 8). Thus, the valency of sulphur = 2.
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Knowledge Check

  • The valency of an element with atomic number 8 is :

    A
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    B
    6
    C
    2
    D
    1

  • What is the valency of the element with atomic number 36 and mass number 84 ?

    A
    2
    B
    4
    C
    0
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  • the maximum valency of an element with atomic number 7 is

    A
    `2`
    B
    `5`
    C
    `4`
    D
    `3`

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