Question

Isodiaphers are atoms having-

• A. p/n constant
• B. (p+n) constant
• C. (n-p) constant
• D. (n-p) different

Answer 1

The correct option is C

(n-p) constant

Step 1:

There are different types of nuclides, Isodiaphers is one of the types of nuclides.

Isodiaphers are the set of nuclides having different numbers of protons and different numbers of neutrons but the difference between proton and neutrons are the same.

Step 2:

Thorium ($\mathrm{Th}$) 234 and Uranium ($\mathrm{U}$) 238.

In Thorium, Neutrons = 144 and Protons = 90

The difference between neutrons and protons (n-p) = 144 - 90 = 54

In Uranium, Neutrons= 146 and Protons = 92

The difference between neutrons and protons (n-p) = 146 - 92 = 54

Hence, the (n-p) is same. Therefore, Thorium -234 and Uranium -238 are Isodiaphers.

Final Answer:

Hence, The correct answer is option (C).