Question

let me answer with explanation

Answer 1

tis atomic no is 26 and it is Fe

Answer 2

☆☆ AS-SALAMU-ALYKUM ☆☆

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ATOMIC NUMBER OF ARGON IS 18 .

ELECTRONIC CONFIGURATION OF ARGON IS :-
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1s^2,2s^2, 2p^6, 3s^2 , 3p^6

IN QUESTION AN ELEMENT'S ELECTRONIC CONFIGURATION IS GIVEN WHICH IS [Ar]3d^5

WE CAN ALSO WRITE IT AS:-
▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪

1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 3d^5 .

BY ADDING THE NUMBER OF ELECTRONS WE GET :-
▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪▪

2+2+6+2+6+5= 26

WE GET 26 ELECTRONS

AND WE KNOW THAT 'Fe' HAS ATOMIC NUMBER 26

SO ANSWER IS OPTION '3' THAT IS 26

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