Question

why do all emlent of same group have similar property​

Answer 1

(i) All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.

(ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.

Answer 2

Answer:

The elements in a given group possesses similar electronic configuration, as the number of electrons in the respective outermost shells is the same. So, they have similar physical and chemical properties.

Step-by-step explanation:

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