Answers

2016-02-27T09:45:43+05:30
This is because elements in the same group have same number of valence electrons. Chemical properties depend on number of valence electrons. So, they have similar properties.
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2016-02-27T09:51:07+05:30
Atoms react depending on the number of electrons in their outermost orbit. so elements in the same group have same number of valence electrons i.e. electrons in t he outermost orbit and therefore they have similar chemical properties
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