Explain why atomic radius of Ga is less ...

Explain why atomic radius of Ga is less than that of Al.

Text Solution

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Gallium comes immediately after the first transition series in which 3d orbitals is filled with electrons . Due to the poor shielding effect of these d-electrons, effective nuclear charge of gallium increases.Consequently the atomic radius of gallium is less than that of aluminium .

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Identify the correct statements from the following (i) The atomic radius of Al is lower than the atomic radius of Ga. (ii) Boron exists in many allotropic forms. (iii) The melting point of Ga is lowest among the group 13 elements.

`i,ii,iii`

ii, iii

`I,ii`

`I,iii`

(A) : Increase in the atomic radius from B to Al is more than that of consecutive elements of the same group (R) : Electrons in penultimate shell have greater screening effect

Both A and R are correct. R is the correct explanation of A.

Both A and R are correct. R is not the correct explanation of A.

A is true, but R is false

A is falsc, but R is true

(A) : Mg^(2+) and Al^(3+) are isolectronic but the magnitude of ionic radius of Al^(3+) is less than that in Mg^(2+) . (R ) : The effective nuclear charge on the outermost electrons in Al^(3+) is greater than that in Mg^(2+) .

Both A and R are correct. R is the correct explanation of A.

Both A and R are correct, R is not the correct explanation of A.

A is true and R is false

A is false , but R true