Question

The element of the same period have different properties. Give reason. ​

Answer 1

Answer:

Elements in the same group have similar properties because they have the same number of valence electrons in their outermost shell. Elements in the same period have different properties because the number of valence electrons in their outermost shells differ.

Explanation:

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Answer 2

Answer:

They are known as isomers.

Example :- The mass of Hydrogen exists in three forms.