Question

Why do elements in the same group have similar physical and chemical properties?
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Answer 1

$\huge\mathbb{\underline{Answer}}$

In chemistry, a group is a vertical column in the periodic table of the chemical elements. Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell (most chemical properties are dominated by the orbital location of the outermost electron).

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Answer 2

Explanation:

elements in same group have similar physical and chemical properties because in modern periodic table there is a tem known as periodicity which means after a fixed period the properties repeates or increase or decrease in physical or chemical properties