Join the Most Relevant JEE Main 2025 Test Series & get 99+ percentile! Join Now
Search any question & find its solution
Question: Answered & Verified by Expert
A metallic ion M2+ has an electron configuration of 2, 8, 14 and its mass is 56 amu. The number of neutrons in the nucleus is
ChemistryChemical KineticsNEET
Options:
  • A 24
  • B 30
  • C 32
  • D 56
Solution:
1062 Upvotes Verified Answer
The correct answer is: 30
As metal ion M2+ 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 .

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.