Question

Hydrogen shows both electropositive and electronegative character. Give reason

Answer 1

hydrogen shows a dual nature because in alkali metals of group 1A or group 1 hydrogen can from cation or positive ion for example H=(H+)+(e-) and in lithium Li=(Li+)+(e-) but in group 17 it forms electro negative character for example H+(e-)=(H-) and in chlorine Cl+(e-)=(Cl-).


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Answer 2

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Because, Hydrogen is special Case

Know more :-

ELECTRONEGATIVITY

• Electronegativity is the ability of an atom to attract electrons in a covalent bond.
• Non-metals are more Electronegative.
• Most electronegative elements in the periodic table are :- Fluorine > Oxygen > Nitrogen ≥ Chlorine
• It increases from moving left to right in a period due to increase in effective nuclear charge.
• It decreases as we move from top to bottom as size of atom increases.

ELECTROPOSITIVITY

• Electropositivity is the ability of an atom to withdraw a shared pair of electrons in its combined state.
• Metals are more Electropositive.
• Caesium is most electropositive metal.
• It increases down the group.
• It decreases along the period.
• Example :- Sodium(Na) is a electropositive element & able react with zinc oxide to reduce it metallic zinc, while itself being oxidized to the oxide.