Question

$<marquee \: behaviour = alternate><font \: color =green>explain diagonal relationship$

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Answer 1

Step-by-step explanation:

1. diagonal relationship is a phenomenon of period2 and period3 only.
2. elements showing diagonal relationship resemble in their physical and chemical property.
3. this happen due to similar size of or similar charge denaity.
4. diagonal relationship is not effective in latet members of the period.

please refer to attachment

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Answer 2

★ Diagonal relationship

The diagonal relationship is that the properties of one element in the periodic table are similar to the properties of another element located at the lower right of it. This relationship is particularly evident between light elements. The properties of some light elements and their compounds are obviously different from those of other elements and their compounds in this family, while some properties are similar to those of the lower right elements and their compounds, such as lithium and magnesium, beryllium and aluminum.

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★Similarities between lithium and magnesium

• ① Combustion in oxygen generates oxides, while other alkali metals generate peroxides and superoxides.
• ② Can directly interact with nitrogen to generate nitrides Li3N and Mg3N2, while other alkali metals do not Nitrogen reacts directly.
• ③Fluoride, carbonate and phosphate are difficult to dissolve in water, while the corresponding salts of other alkali metals are easily soluble in water.
• ④Aqueous chloride hydrolyzes when heated .
• ⑤The alkylate is covalent and easy Soluble in organic solvents, and sodium alkyl is an ionic compound.

★ Similarity of beryllium and aluminum

• ① The electrode potentials are similar, beryllium is -1.85 volts, aluminum is -1.66 volts, and beryllium's family element magnesium is -2.363 volts.
• ②Passivation in cold concentrated nitric acid, and magnesium interacts with nitric acid.
• ③ Hydroxide is amphoteric, while magnesium hydroxide is alkaline.
• ④Anhydrous chloride is easily vaporized and soluble in organic solvents, while molten magnesium chloride can conduct electricity.

★ Similarity of boron and silicon

• ① The electronegativity of boron is 2.04, silicon is 1.90, the two are similar; the density of boron and silicon are 2.35 (298k) and 2.336 (293k) g / cm, which are also similar.
• ② Boron and silicon The hydride is a gas at normal temperature.
• ③The hydrate of oxide is an acid.
• ④The chloride is completely hydrolyzed, while the aluminum chloride is only partially hydrolyzed.