2 nuclides X and Y are isotonic to each other with mass numbers 70 and 72 respectively. If the atomic number of X is 34, then that of Y is:
A) 32
B) 34
C) 36
D) 38

Question

2 nuclides X and Y are isotonic to each other with mass numbers 70
and 72 respectively If the atomic number of X is 34, then that of Y
is:
A) 32
B) 34
C) 36
D) 38

Ravjot Kaur · Accepted Answer

Dear student
Please find the solution to the asked query:

One of two or more atoms whose nuclei have the same number of
neutrons but different numbers of protons are called Isotones
Here Given two atoms X and Y which have mass numbers 70 and 72
respectively

Atomic number of X is 34
This means that number of protons in X =34
The number of neutrons becomes :70-34 = 36

In isotones, the no of neutrons are same
So Y has 36 neutrons
Then the no of protons in Y = 72-36 =36
No of protons = no of electrons = atomic number
So the atomic number of the element Y =36

Hence the correct option is C

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2 nuclides X and Y are isotonic to each other with mass numbers 70 and 72 respectively. If the atomic number of X is 34, then that of Y is: A) 32 B) 34 C) 36 D) 38

2 nuclides X and Y are isotonic to each other with mass numbers 70 and 72 respectively. If the atomic number of X is 34, then that of Y is:
A) 32
B) 34
C) 36
D) 38