Question

out of the two elements X and Y which has bigger atomic radius x has atomic number 18 and atomic mass 40 y has atomic number 20 and atomic mass 40

Answer 1

THE ATOMIC RADIUS OF ELEMENT y WOULD BE GREATER BECAUSE

IN A NEUTRAL ATOM

ATOMIC NUMBER=NUMBER OF ELECTRONS

AND IN THIS CASE THERE ARE MORE NUMBER OF ELECTRONS WHICH WILL RESULT INTO MORE NUMBER OF COMPLETED SHELL

IN X ITS ELECTRONIC CONFIGURATION=2 8 8

WHILE IN THAT OF Y IT IS 2 8 8 2

IT MEANS THAT Y HAS MORE NUMBER OF SHELLS SO ITS ATOMIC RADIUS IS ALSO LARGER THAN X

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