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An element with Z = 82 belongs to ----- group and ------- period of modern periodic table

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14, 6

12, 5

16, 7

12, 6

answer is C.

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Detailed Solution

Hints to predict the position of element in the Modern periodic table :

1)Elements from Z = 31-57….subtract 18 to get preceding element of the group;

2)Elements from Z = 72-89….subtract 32 to get preceding element of the group

3)Elements from Z = 104-120….subtract 32 to get preceding element of the group;

Ex : Z=114, 82, 50, 32, 14, 6….belong to 14th(IVA) group;

(114-32)=82; (82-32)=50; (50-18)=32; (32-18)=14;

Z = 14…..Si….3s²3p²…..n=3….3rd period.

Z = 32…..Ge….4s²4p²…..n=4….4th period.

Z = 50…..Sn….5s²5p²…..n=5….5th period.

Z = 82…..Pb….6s²6p²…..n=6….6th period.

Z = 114…..Fl….7s²7p²…..n=7….7th period.

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