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Telangana TET Paper 2 Math and Science Model Paper 2

Section: Math and Science

Question : 99 of 150

Marks: +1, -0

Which of the following is a pair of isotones?

Solution:

Concept:

Isotones are atoms with the same number of neutrons.

Explanation:

Neutron number = mass number − atomic number.

For option B:

_{6}C^{13}

→

13-6=7

neutrons;

_{7}N^{14}

→

14-7=7

neutrons. Both have 7 neutrons, so they are isotones.

The table shows neutron counts for all pairs. Only option B has equal neutrons.

Answer:

Option B:

_{6}C^{13}, _{7}N^{14}

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