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How to identify the period or group of a given element |
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Answer» Group : if valancy of element is 1 or 2 it group will be 1 or 2 . when if valancy of element is more than 2 and + 10 .Ex: X element has 5 valancy electron ,it\'s group will be 5 + 10=15 Period : no. Of electrons shell in its atom. Ex: if an element has 3 electrons shells (k,l,m)in the atom it belong to period 3 If there r 2 digit in eletronic confurigstion than period is 2 and if there is 4 on past digit no than groupis 14 Number of shells is equal to the number of periods and the number of electrons in the last shell gives us group number. If the electron in last shell is less than 3 then it\'s group number is same but if it is more than 3 then, number of electrons in last shell +10 give us group number... |
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