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Given reason: While going down in the gr...

Given reason: While going down in the group 1, the chemical reactivity of metals increases.

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### Step-by-Step Solution: 1. **Understanding Chemical Reactivity**: - Chemical reactivity of metals is primarily determined by their ability to lose electrons. The easier it is for a metal to lose its outermost electron, the more reactive it is. 2. **Structure of an Atom**: - An atom consists of a nucleus (containing protons and neutrons) and electrons that orbit around the nucleus in shells. The outermost electrons are the ones involved in chemical reactions. ...
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