Q. No.The maximum number of elements that can be accommodated in the sixth period are :
1. 8
2. 18
3. 32
4 16
The element named after Lawrence Berkeley Laboratory is:
1. Seaborgium
2. Lawrencium
3. Moscovium
4. Hafnium
Boron has lesser ionization enthalpy than Beryllium, because:
| 1. | It is easier to remove electrons from p - a subshell than a filled s - subshell. |
| 2. | The s-electron can be removed easier than the p-electron. |
| 3. | Ionization enthalpy decreases with an increase in atomic number. |
| 4. | Ionization enthalpy increases along the period. |
Incorrect statement about metal is:
1. Metals can donate electrons.
2. Metals form ionic compounds.
3. Metals are more electronegative.
4. Metals have less ionization energy.
The group number that has non-metal, liquid as well as gas at room temperature is:
| 1. | 15 | 2. | 14 |
| 3. | 18 | 4. | 17 |
| 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 |
1. III
2. IV
3. II
4. V
1. Curium (Z = 96)
2. Californium (Z = 98)
3. Uranium (Z = 92)
4. Terbium (Z = 65)
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 |
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