Q. No.
Those in a group that falls under the law of triads include:
1. Cl, Br, I
2. C, N, O
3. Na, K, Rb
4. H, O, N
All the non-metals in the long form of the periodic table are placed under:
1. s-Block
2. p-Block
3. f-Block
4. d-Block
The statement that is incorrect for the periodic classification of elements is:
| 1. | The properties of elements are a periodic function of their atomic number. |
| 2. | Non-metallic elements are lesser in number than metallic elements. |
| 3. | The first ionization energies of elements along a period do not vary in a regular manner with an increase in atomic number. |
| 4. | For transition elements, the d-subshells are filled with electrons monotonically with an increase in atomic number. |
An example of metalloid elements in the periodic table is:
| 1. | Na and K | 2. | Cu and Al |
| 3. | As and Si | 4. | Ca and Mg |
Sodium generally does not show an oxidation state of +2, because of:
1. High first ionization potential.
2. High second ionization potential.
3. Large ionic radius.
4. High electronegativity.
The electronegativity of the following elements increases in the order of:
| 1. | S < P < N < O | 2. | P < S < N < O |
| 3. | N < O < P < S | 4. | N < P < S < O |
Elements with an electronic configuration 1s2 2s22p6 3s23p63d10 4s24p64d10 5s25p3 belong to the group :
| 1. | 3rd | 2. | 15th |
| 3. | 17th | 4. | 2nd |
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