When we write the definition for metals we say every thing that produces positive ions (except than hydrogen) by losing electron

And for non-metals we write the opposite but still the Hydrogen is exceptional element.Why such happens?

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Solution

This is because,
You might know that hydrogen only has 1 electron so to attain stability it has 2 choices.
1. It can loose the electron and for H+, and have no electron so no question of stability, because there are no shells left.
2. It can gain an electron and have 2 electrons in the outermost shell, which is a stable configuration of elements with only one shell, and form H-
So in this way it has an exceptional behaviour.

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When we write the definition for metals we say every thing that produces positive ions (except than hydrogen) by losing electron And for non-metals we write the opposite but still the Hydrogen is exceptional element.Why such happens?

When we write the definition for metals we say every thing that produces positive ions (except than hydrogen) by losing electron

And for non-metals we write the opposite but still the Hydrogen is exceptional element.Why such happens?