Home
Class 11
CHEMISTRY
Gallium lies below aluminium in group 13...

Gallium lies below aluminium in group 13 of the periodic table but its atomic radius is smaller than that of aluminium. Why so ?

Text Solution

Verified by Experts

Due to poor shielding of the valence electrons of Ga by the inner 3d-electrons , the effective nuclear charge of Ga is greater in magnitude than that of Al. As a result , the electron in gallium experience greater force of attraction by the nucleus than in Al and hence atomic size of Ga (135pm) is slightly less much higher than that of Al (143pm).
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SOME p-BLOCK ELEMENTS

    PRADEEP|Exercise ANALYTICAL QUESTIONS AND PROBLEMS WITH ANSWER SOLUTION (Problems )|3 Videos

  • SOME p-BLOCK ELEMENTS

    PRADEEP|Exercise Competition Focus (JEE( Main and Advanced)/Medical Entrance) (1. Multiple Choice Questions) I. Group 13 Elements|43 Videos

  • SOME p-BLOCK ELEMENTS

    PRADEEP|Exercise ADDITIONAL QUESTIONS (LONG ANSWER QUESTIONS)|7 Videos

  • SOLID STATE

    PRADEEP|Exercise Advanced problems|19 Videos

  • STATES OF MATTER : GASES AND LIQUIDES

    PRADEEP|Exercise VIII. ASSERTION-REASON TYPE QUESTIONS (TYPE-II)|12 Videos

Similar Questions

Explore conceptually related problems

Why the atomic radius of gallium is less than that of Al?

An element X is in group 13 of the periodic table. What is the formula of its oxide?

Knowledge Check

  • Ga is below Al in the periodic table, but atomic radius of Ga is less than Al. It is because of

    A
    Lanthanoid contraction
    B
    Greater screeing effect
    C
    Inert pair effect
    D
    None of these

  • An element which lies in the same group of the periodic table as mercury is

    A
    cadmium
    B
    gold
    C
    tin
    D
    thallium

  • Aluminium is diagonally related to (in periodic table)

    A
    Li
    B
    C
    C
    B
    D
    Be

    • Similar Questions

    Explore conceptually related problems

    Gallium has much higher atomic number than aluminium yet its atomic radius is lower than that of aluminium. Justify.

    Table given below shows a part of the periodic table Using this table explain why Atomic size of Mg is less than that of Na

    The first ionisation potential of aluminium is smaller than that of magnesium because

    An element X belongs to group 17 and 2nd period of the periodic table. Its atomic number will be

    Assertion: The first ionisation enthalpy of aluminium is lower than that of magnesium. Reason : Ionic radius of aluminium is smaller than that of magnesium.

    Home
    Profile