Question

state the reasons for the following-
1. The elements in same group have same chemical properties.
2. the elements of the same period have different properties​

Answer 1

1. Due to same no. of Valence electron the elements in same group have same chemical properties.

2. Due to different no. of Valence electrons the elements in different period have different chemical properties.

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Answer 2

Explanation:

1.the elements of the same groups have same chemical properties because their valence electron is same .it means that their outer most she'll contains same no. of electron.

2.thier valence electron is not same