Q. No.The correct order of metallic character of elements B, Al, Mg and K is :
1.
B > Al > Mg > K
2.
Al > Mg > B > K
3.
Mg > Al > K > B
4.
K > Mg > Al > B
Considering the elements B, C, N, F, and Si; the correct order of their non-metallic character is :
| 1. | B > C > Si > N > F | 2. | Si > C > B > N > F |
| 3. | F > N > C > B > Si | 4. | F > N > C > Si > B |
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
Among the following elements, the one that is not an actinoid is:
| 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
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