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Explain the following according to Moder...

Explain the following according to Modern periodic table: ltbr. (a) Electronegativity of elements increase on moving from left to right in a paeiod.
(b) Ionisation enthalpy decrease in a group from top to bottom.

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The correct Answer is:
(a) On moving left to right in a period, tendency of an atom to attract the shared electron pair towards itself increases due to increasing `Z_(eff)`. So, electronegativity of elements increase on moving from left to right in a period.
(b) On moving top to bottom in a group, size increases due to addition of extra shells. So, attraction of nucleus outermost electron decreases. So, ionisation enthalpy decrease in a group from top to bottom.
(a) On moving left to right in a period, tendency of an atom to attract the shared electron pair towards itself increases due to increasing `Z_(eff)`. So, electronegativity of elements increase on moving from left to right in a period.
(b) On moving top to bottom in a group, size increases due to addition of extra shells. So, attraction of nucleus outermost electron decreases. So, ionisation enthalpy decrease in a group from top to bottom.
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Explain the following : (a) Electronegativity of elements increases on moving from left to right in the periodic table . (b) Ionisation enthalpy decreases in a group from top to bottom ?

Explain the following a) Electronegatively of elements increase on moving from left to right in the periodic table. b) Ionisation enthalpy decrease in a group from top to bottom.

Knowledge Check

  • In the periodic table, the ionisation potential in a group…..from top to bottom

    A
    increases
    B
    decreases
    C
    does not change
    D
    can not be predicted

  • In the second period of periodic table, the ionisation potential of elements increases from left to right because of

    A
    increase in densities
    B
    decrease in chemical reactivities
    C
    decrease in atomic size
    D
    decrease in electronegativities

  • On going from right to left in a period in the periodic table the electronegativity of the elements

    A
    Increases
    B
    Decreases
    C
    Remain unchanged
    D
    Decreases first then increases

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