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NTA Abhyas NEET2020ChemistryChemical KineticsPractice

A metallic ion M 2 + has an electron configuration of 2, 8, 14 and its mass is 56 amu. The number of neutrons in the nucleus is

Options

  1. A24
  2. B30
  3. C32
  4. D56

Correct answer

B. 30

Step-by-step solution

As metal ion M 2 + has an electron configuration of 2, 8, 14 so The metallic atom (M) has a total number of electron = 2 + 8 + 14 + 2 = 26 . Therefore, the number of protons in the nucleus = 26. Hence, the number of neutrons = A - Z = 56 - 26 = 30 .

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