Question

Which pair of elements have same chemical properties?

Answer 1

Explanation:

Answer: Elements in the same group in the periodic table have similar chemical properties. This is because theiratoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals.

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Answer 2

Explanation:

The pair which belongs to some group i.,e in which both the elements have same outer electronic configuration have same chemical properties.

Therefore, 3.......... 1s^2 ,2s^1

11............ 1s^2,2s^12p^2, 3s^1