The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
  1. 13
  2. 10
  3. 14
  4. 16

AcademicChemistryNCERTClass 9

Correct Answer:  (b) 10
Explanation: Mass number of the element = 27
Number of neutrons = 14
Number of protons = mass number – number of  neutrons
= 27 – 14 = 13
As the ion of this element has 3 positive charges,  it means that it has lost 3 electrons. Therefore, there are 10 electrons in the ion. 
raja
Updated on 10-Oct-2022 13:32:55

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