An ion has a charge of +3. The nucleus of the ion has a mass
CHEMISTRY
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An ion has a charge of +3. The nucleus of the ion has a mass of 120. The number of neutrons in the nucleus is 1.50 times that of the number of protons. How many electrons are in the ion?
- A) 55
- B) 48
- C) 45
- D) 42
Correct Answer: C) 45
Explanation
Mass Number = Atomic Number + Number of Neutrons
Neutron Number = 1.50 \(\times\) Atomic Number
So, 120 = A + 1.5A
120 = 2.5A
A = 48
Number of Protons = 48
Since, the ion has a positive charge, it must have lost electrons.
Therefore, the number of electrons = 48 - 3 = 45.
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