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Question

What is the ratio of the number of neutrons present in potassium (Z=19) and magnesium (Z=12) atoms with mass numbers 39 and 24, respectively? (Z = atomic number)​
  1. 9 : 12
  2. 5 : 3
  3. 5 : 6
  4. 4 : 3


Solution

The correct option is B 5 : 3

The number of protons gives the atomic number. The number of protons and neutrons together gives the mass number. ​

Thus,​

Number of neutrons (n) = Mass number - Atomic number ​

For potassium, n = 39 - 19 = 20 ​

For magnesium, n= 24 - 12 = 12. ​

Hence, ratio of neutrons is 20:12 or 5:3.​

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