the electronic configuration of an element x is 2'8' 7 ? to which period does x belong ? how many electons are present in its outermost shell and what is its valency ?
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The element is chlorine and it belongs to Period 3 and Group 17.....It has 7 electrons in valence shell and its valency is -1
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The electron figuration as follows:
2 : 8 : 7
The element has three energy levels from the electron configuration given above.
The outermost energy level has 7 electrons which means it reacts by gaining electrons.
The number of energy levels gives the period of the element hence the period of the element is 3.
The number of electrons in the outermost energy levels gives the group of the element.
The element is therefore in group 7.
In this case the identity of this element is Chlorine.
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