Question
In periodic table how reactivity of elements get changed ?
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Answer
In a period, the chemical reactivity of the elements of the first group is very high, it decreases after reaching the middle and after reaching group 17 , it increases again and becomes very high. Similarly, in a group of common elements (e.g. alkali metals) the reactivity increases from top to bottom, whereas in a group of non-metals (e.g. halogen family) the reactivity decreases from top to bottom.
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