Question

How many electrons and neutrons are present in radioactive Co⁺³ ion(Z=27)?

• A. 27,27
• B. 33,33
• C. 24,33
• D. 30,30

Answer 1

The correct option is C

24,33

Explanation for the correct option

• Option(C): Given the atomic number is 27 and thus the number of electrons in a neutral cobalt atom will be 27.
• Here we have Co⁺³ ion hence 3 electrons have been removed from the atom.
• Number of electrons=(27-3) = 24
• The mass number of Co-60 is 60.
• Mass number = number of protons + number of neutrons
• Number of protons = atomic number = 27
• Hence number of neutrons = (60-27) = 33
• Thus the correct option is (C) ie., electrons and neutrons present in radioactive Co⁺³ ion are 24,33.