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  4. An isotone of 32 Ge 76 is i. 32 Ge 77 ii. 33 As 77 iii. 34 Se 77 iv. 34 Se 78

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Q. An isotone of ${ }_{32} Ge ^{76}$ is
i. ${ }_{32} Ge ^{77}$
ii. ${ }_{33} As ^{77}$
iii. ${ }_{34} Se ^{77}$
iv. ${ }_{34} Se ^{78}$

Structure of Atom

Solution:

Isotones have same number of neutrons
${ }_{32} Ge ^{76} n=76-32=44$
1. ${ }_{32} Ge ^{77} n=77-32=45$
2. ${ }_{33} As ^{77} n=77-33=44$
3. ${ }_{34} Se ^{77} n=77-34=43$
4. ${ }_{34} Se ^{78} n=78-34=44$
So answer is (c)