The first ionisation energy of Al is smaller than that of Mg because `:`A. The atomic number of Al is smaller than that of Mg.B. the atomic size of Al is less than that of Mg.C. Penetration of `s-` subshell electrons in case of Mg is greater than that of `p-` subshell in AlD. Mg has incompletely filled `s-` orbital.

The first ionisation energy of Al is smaller than that of Mg because `

1.	The first ionisation energy of Al is smaller than that of Mg because `:`A. The atomic number of Al is smaller than that of Mg.B. the atomic size of Al is less than that of Mg.C. Penetration of `s-` subshell electrons in case of Mg is greater than that of `p-` subshell in AlD. Mg has incompletely filled `s-` orbital.
Answer» Correct Answer - 3 Penetration of `p-` subshell electron is less than `s-` subshell electrons. In case of `Mg`, the first electron is to be removed from completely filled `3s^(2)` valence shell configuration as compared to partially filled `3p^(1)` of Al. These two factors collectively accounts for the higher ionisation energy of Mg than that of Al. Therefore, `(C )` option is correct.

Discussion

No Comment Found

Related InterviewSolutions

Choose the correct ordera). `Si lt P lt Cl lt S ` (2nd ionisation energy)b)`F lt O lt N lt C` (2nd ionsiation energy)c)`F gt C gt Br gt I` (electronegativity)d)`Be^(2+) lt Li^(+) lt Na^(+) lt K^(+)` (Mobility of ion in aqueous solution )A. `Si lt P lt Cl lt S ` (2nd ionisation energy)B. `F lt O lt N lt C` (2nd ionsiation energy)C. `F gt C gt Br gt I` (electronegativity)D. `Be^(2+) lt Li^(+) lt Na^(+) lt K^(+)` (Mobility of ion in aqueous solution )
S-1:- `Na_(2)O lt MgO lt ZnO lt P_(4)O_(10)` : acidic property S-2:- `Na lt Si gt Mg gt Al` : First ionisation potential S-3:- `F gt Cl gt Br` : Electron affinity. S-:- `Te^(2-) gt I^(-) gt Cs^(+) gt Ba^(2+)` : Ionic sizeA. TTTTB. TTFTC. TFFTD. TFTT
Which of the following is/are correct order regarding radius ?a)`Al^(3+) lt Mg^(2+) lt Na^(+)`b)`B^(3+) lt Ga^(3+) lt Al^(3+)`c)`Be^(2+) lt B^(3+) lt Li^(+)`d)`Cl^(-) lt S^(2) lt P^(3-)`A. `Al^(3+) lt Mg^(2+) lt Na^(+)`B. `B^(3+) lt Ga^(3+) lt Al^(3+)`C. `Be^(2+) lt B^(3+) lt Li^(+)`D. `Cl^(-) lt S^(2) lt P^(3-)`
Which of the following statements (s) is/are not true about the diagonal relationship of `Be` and `Al`?A. Both reacts with alkali to liberate hydrogenB. Their oxides are basicC. They are made passive by nitric acidD. Their carbides give acetylene on treatment with water .
Which of the following are correct ?A. The configuration of Mo`(Z = 42)` is [Kr] `4d^(5) 5s^(1)`B. The configuration of Mo(Z= 42) is [Kr] `4d^(4) 5s^(2)`C. The configurtion of Ag(Z = 47) is [Kr] `4d^(10) 5s^(1)`D. The configurationof Ag (Z= 47) is [Kr] `4d^(10) 5s^(2)`
Which of the following is / are the correct order of mobility in aqueous solutions ?a)`Li^(+) lt Na^(+) lt K^(+)`b)`Na^(+) lt Mg^(2+) lt Al^(3+)`c)`Al^(3+) lt Mg^(2+) lt Na^(+)`d)`Li^(+) gt Na^(+) gt K^(+)`A. `Li^(+) lt Na^(+) lt K^(+)`B. `Na^(+) lt Mg^(2+) lt Al^(3+)`C. `Al^(3+) lt Mg^(2+) lt Na^(+)`D. `Li^(+) gt Na^(+) gt K^(+)`
Which of the following is / are the correct order of mobility in aqueous solutions ?A. `Li^(+) lt Na^(+) lt K^(+)`B. `Na^(+) lt Mg^(2+) lt Al^(3+)`C. `Al^(3+) lt Mg^(2+) lt Na^(+)`D. `Li^(+) gt Na^(+) gt K^(+)`
In most of the lanthanides, the penultimate shell contains __________electrons in __________ orbitals.
Which of the following has the same number of electrons in its outermost shell and penultimate shell ?A. `AI^(3+)`B. `Ca^(2+)`C. `F^(-)`D. `N^(3-)`
Which group of elements is analogous to the lanthanides?A. HalidesB. ActinidesC. ChalcogenidesD. Borides

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment