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Howdoes themetallicand nonmetalliccharactervaryof movingfrom leftto rightin a period? |
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Answer» Solution :On movingfrom LEFTTO right ina periodthe numberof valenceelectronicincreasesby oneat eachsucceedingelement butthe numberof shellsremains THESAME .As a resultthe nuclearchargeincreasesand thetendencyof the elementofloseelectronsdecreases and hencethe metalliccharacterdecreasesas wemove from leftto right in a period . conversely ,asthe nuclearcharge increase the tendencyof theelement togainelement increases andhence thenon- metallicincreases fromleft to ritght in a period. Alternatively metallic characterdecreases and non- metalliccharacter INCREASESAS wemovefrom lefttoright inaperiod.It is due toincreasesin ionizationenthalpyand NEGATIVE electrongainenthaply. |
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