Though hydrogen is a non - metal it has been placed in activity series. Because like metals hydrogen also lose its electron and form positive ion i.e H+ ion.

Hydrogen is a non metal ...it is arranged in metal reactivity series because sometimes it reacts as metal as it loose electrons to form positive ions

Introduction:

The reactivity series is a way to organize metals based on their reactivity with other substances. Normally, it consists of metals only, but hydrogen is an exception and is included in the series despite being a non-metal. This is because hydrogen exhibits similar reactivity properties as metals, particularly when it reacts with acids and forms positive ions.

Explanation:

1. Similarity to metals:
- Hydrogen, although a non-metal, shares some similarities with metals in terms of its chemical behavior.
- Like metals, hydrogen can lose an electron and form a positive ion (H+).
- It can also react with acids to produce hydrogen gas and a salt, which is a characteristic behavior of metals.

2. Reactivity with acids:
- Hydrogen reacts with acids to form salts and hydrogen gas. This reaction is similar to how metals react with acids to produce hydrogen gas and metal salts.
- For example, when hydrogen reacts with hydrochloric acid, it forms hydrogen chloride gas and water, which is similar to the reaction of metals such as magnesium with hydrochloric acid.

3. Placement in the reactivity series:
- Hydrogen is placed in the reactivity series above metals like copper, silver, and gold, which are less reactive.
- This indicates that hydrogen is more reactive than these metals and can displace them from their compounds.
- For example, when hydrogen gas is passed over copper oxide, it reacts to form water and copper metal, displacing the copper from the compound.

Conclusion:

Hydrogen, despite being a non-metal, is included in the reactivity series because it exhibits similar chemical reactivity to metals, particularly when it reacts with acids. Its ability to form positive ions and displace less reactive metals from compounds justifies its placement in the series. Understanding the reactivity series helps in predicting the behavior of metals and non-metals in various chemical reactions.