Question

group and period of elements having 3 cells with 3 electrons in valence shell​

Answer 1

Answer:

The group number is 13 and period is 3. Explanation: An element which has three shells (it means that n = 3) with three electrons (it means that 3 valence electrons). The value of principle quantum number denotes the period in which an element belongs.

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Answer 2

Valence Electrons determine the group of an element.

So this means this element is in Group III

Shells determine the period of an element.

So this means the element is is Period 3

The element in Group III and Period 3 is Aluminium ( Al )

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