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

Answer 1

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OPTION C) IS THE CORRECT ANSWER OF UR QUESTION

y = 36

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Answer 2

Answer:

If the atomic number of X is 34, then atomic number of Y is 36.

Therefore, the option (C) is correct.

Explanation:

• Nuclides are the nuclei species of atom which contains neutrons and protons.
• Isotones are the nuclides which have same number of neutrons but different number of protons. For example carbons -12 and nitrogen -13 are isotones.

We have given the mass number of nuclide X = 70

The mass number of nuclide of Y = 72

The atomic number of nuclide of X = 34

Atomic number (Z) = Number of protons

Therefore, number of protons in nuclide X = 34

$Mass\;\; Number$ = Number of protons + number of neutrons

Number of neutrons = Mass Number (A) - Number of protons

Number of neutrons in nuclide X = 70 - 34 = 36

For isotones , number of neutrons in X = no. of neutrons in Y

Number of neutrons in nuclide Y = 36

Atomic number of nuclide Y = Mass number - number of neutrons

Atomic number of nuclide Y = 72 - 36 = 36