A reduction in atomic size with increase in atomic number is a characteristic of elements of:

  • Option 1)

    f-block

  • Option 2)

    radioactive series

  • Option 3)

    high atomic mass

  • Option 4)

    d-block

 

Answers (1)

As we learned in concept

Application of shielding effect -

1.  It has been used in explaining the inert pair effect.

2.  It has been used to explain the lanthanide and actinide contraction.

-

 

 Because of the shape of orbitals, the shielding effect of electrons is too little. This is called lanthanide contraction.

As we move down the group, atomic charge increases but because of shielding effect; atomic size decreases as electrons are pulled closer by greater nuclear charge.


Option 1)

f-block

This option is correct.

Option 2)

radioactive series

This option is incorrect.

Option 3)

high atomic mass

This option is incorrect.

Option 4)

d-block

This option is incorrect.

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