Elements | |||
I | 520 | 7300 | -60 |
II | 419 | 3051 | -48 |
III | 1681 | 3374 | -328 |
IV | 1008 | 1846 | -295 |
V | 2372 | 5251 | +48 |
VI | 738 | 1451 | -40 |
The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on electrons in its outer shell is :
1. s > p > d > f
2. f > d > p > s
3. p < d < f < s
4. f > p > s > d
The first ionisation enthalpies of Na, Mg, Al, and Si are in the order of:
1. Na < Al < Mg < Si
2. Na > Mg > Al > Si
3. Na < Mg < Al < Si
4. Na > Mg > Al < Si
Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is:
1. | F > Cl > Br > I | 2. | F < Cl < Br < I |
3. | F < Cl > Br > I | 4. | F < Cl < Br > I |
The period number in the long form of the periodic table is equal to :
1. | Magnetic quantum number of any element of the period. |
2. | Atomic number of any element of the period. |
3. | Maximum principal quantum number of any element of the period. |
4. | Maximum azimuthal quantum number of any element of the period. |
The elements in which electrons are progressively filled in 4f-orbitals are called:
1. | Actinoids | 2. | Transition elements |
3. | Lanthanoids | 4. | Halogens |
The correct order of size of the given species is:
1. | I > I– > I+ | 2. | I+ > I– > I |
3. | I > I+ > I– | 4. | I– > I > I+ |
The outermost electronic configuration of the last element of the p-block in the 6th period is represented by:
1.
2.
3.
4.