Question

why are group 1,2,13-17 called representative element
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Answer 1

Answer:

According to the Aufbau principle, in the ground state of an atom or ion the electrons fill atomic orbitals of the lowest energy levels first, before filling the higher energy levels. So, in groups 1,2,13,14,15,16,17,18 the electrons fill in the orbitals of each element according to the Aufbau's principle.

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Answer 2

Explanation:

It is because the table has a change from metals on left side while non metals on the right side