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JAMB Chemistry 2014 Paper

Question : 8

Total: 45

Solution:

Concept:

In neutral atoms, atomic number = protons = electrons, and mass number = protons + neutrons.

Explanation:

For

\mathrm{^{60}_{27}Co}

, the subscript 27 is the atomic number, so protons = 27.

Neutrons = mass number − atomic number =

60 - 27 = 33

Since the atom is neutral, electrons = protons = 27.

So the order is 27, 33, and 27.

Answer:

Option C: 27, 33, and 27.

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