Question

Decide which element probably forms a compound with hydrogen that has a chemical formula most and least similar to the chemical formula of the compound formed by hydrogen and selenium.

Answer 1

Answer:

Sulphur

Explanation:

Hydrogen sulphide

Chemical formula: $H_{2} S$

Oxidation states: +1 and -2

Hydrogen selenide

Chemical formula: $H_{2} Se$

Oxidation states : +1 and -2

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