Get Answers to all your Questions

header-bg qa

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

  • Option 1)

    high atomic masses

  • Option 2)

    d- block

  • Option 3)

    f- block

  • Option 4)

    radioactive series.


Answers (1)


As we learnt in

Atomic Radii -

Atomic radii decrease with increases in atomic number from left to right but the unit of increment is very low.

- wherein

eg\rightarrow \:\:\:58^{Ce}\Rightarrow 183\:\:pm

59^{Pr}\Rightarrow 182\:\:pm



 f-block element shows lanthanoid contraction due to which their size decreases with increase in atomic number. 

Option 1)

high atomic masses

This option is incorrect.

Option 2)

d- block

This option is incorrect.

Option 3)

f- block

This option is correct.

Option 4)

radioactive series.

This option is incorrect.

Posted by


View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE