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In the d-block elements as we move along...

In the d-block elements as we move along a period
the atomic radius decreases in the beginning,
reaches minimum and then increases towards the
end of the series. Explain with appropriate reasons.

Text Solution

Verified by Experts

In a particular series of d-block elements, electron
filling takes place in the penultimate shell. Hence
their atomic size decreascs up to the `7^(th)` group and
reaches minimum and then again increases because
with the pairing of electrons, repulsive force also
increases. The repulsion among the added electrons
exceeds the increased force of attraction (due to the
increase of nuclear charge) after the `8^(th)` group.
Hence, atomic radius increases slightly.
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Knowledge Check

  • As we move along the period, the atomic radii decreases. Which of the following group contradicts the above statement ?

    A
    Alkali metals
    B
    Carbon family
    C
    Halogen family
    D
    Noble gases.

  • The atomic radius decreases as we move across a period because

    A
    atomic mass increases
    B
    atomic number increases
    C
    effective nuclear charge increases
    D
    electrons are added removed.

  • As we move from left to right across a period, there is regular decrease in atomic radii of the representative elements. This is due to

    A
    number of energy shells remain the same while nuclear charge decreases
    B
    number of energy shells remain the same while nuclear charge increases
    C
    nuclear charge remain the same while number of shells decrease
    D
    both number of shells and nuclear charge remain the same.

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    The paramagnetic character in 3d transition series elements increases up to Mn and then decreases. Explain why.

    The atomic size of an element increases down the group while along a period, it tends to decrease. Explain.

    (a) Electropositive nature of the element(s) increases down the group and decreases across the period. (b) Electronegativity of the element decreases down the group and increases across the period. (c) Atomic size increases down the group and decreases across a period (left to right). (d) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Name the element with smallest atomic size.

    (a) Electropositive nature of the element(s) increases down the group and decreases across the period. (b) Electronegativity of the element decreases down the group and increases across the period. (c) Atomic size increases down the group and decreases across a period (left to right). (d) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Name the most electropositive element among them.

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