Question

The diagonal relationship is not shown by

• A. $\mathrm{Li}\mathrm{and}\mathrm{Mg}$
• B. $\mathrm{Be}\mathrm{and}\mathrm{Al}$
• C. $\mathrm{B}\mathrm{and}\mathrm{Si}$
• D. $\mathrm{C}\mathrm{and}\mathrm{P}$

Answer 1

The correct option is D

$\mathrm{C}\mathrm{and}\mathrm{P}$

Diagonal relationship:

1. In S block elements, there is a diagonal link between neighboring elements that are situated in the second and third periods of the periodic table.
2. When compared to the other elements in the subgroup to which they belong, S block elements' attributes differ dramatically.

Explanation of the correct answer:

The correct answer is option D:

1. Allotropes may be found in both carbon and phosphorus.
2. Carbon and phosphorus have nearly identical electronegativities.
3. Both generate powerful sigma and pi bonds.
4. Phosphors can also create triple bonds, much like carbon.
5. Only the second-period metals and groups 1, 2, and 13 exhibits a diagonal connection.
6. $\mathrm{C}\mathrm{and}\mathrm{P}$ thus do not exhibit a diagonal connection.

Explanation of the incorrect answers:

Options A, B, and C:

1. There are several commonalities between the diagonal neighbors.
2. Moving from left to right and down the group reveals this connection; the periodic table includes opposing elements.
3. The varied ways that certain atomic characteristics fluctuate along groups and across periods of the Periodic Table result in diagonal connections.
4. The s and p-block components additionally show diagonal relationships in addition to group and period ties.
5. Thus, $\mathrm{Li}\mathrm{and}\mathrm{Mg}$, $\mathrm{Be}\mathrm{and}\mathrm{Al}$, and $\mathrm{B}\mathrm{and}\mathrm{Si}$ show diagonal relationships.

Hence, option D is correct, i.e., $\mathrm{C}\mathrm{and}\mathrm{P}$.