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ICSE Class 7 Chemistry Question 11 of 16

Atomic Structure — Question 16

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Question 16

State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.

Answer

Group number signifies the number of electrons in the outer shell of an atom of the element.

As the number of electrons in the outer shell of all elements in a group is the same. Hence all elements in the same group of the periodic table have same valency and similar chemical properties.