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Answer 1

Answer:

Valency- Across periodic table, the valency first increases and then decreases. No change in valency down the group. As the number of electrons increases, the electrons are lost from 1st to 4th period. And then, they are eligible to gain electrons. So, Valency increases and then decreases.

Atomic radius- The atomic radius tends to decrease across a period from left to right due to shrinking of atoms because of effective nuclear charge.

Metallic to non-metallic character- Across the period, increasing attraction between the nuclei and the valence shell causes the metallic character to decrease.

Electronegativity- Across a period, the electronegativity increases due to the stronger attraction that the atoms obtain as the nuclear charge increases.

Nature of oxides- Oxides of non-metals are acidic in nature. But, across a period, the metallic character decreases. So, Metallic oxides are basic and Non-metallic oxides are acidic.

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