Question

according to mendeleef how many periods and how many groups in perodic table​

Answer 1

Answer:

Mendeleev divided his periodic table in eight groups and seven periods. Groups from I to VII are meant for normal elements and group VIII is for transition elements

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Answer 2

Answer:

Mendeleev divided his periodic table in eight groups and seven periods. Groups from I to VII are meant for normal elements and group VIII is for transition elements.