Mercury has an atomic number of 80 and a mass number of 200. how many neutrons are in one atom of mercury?

120 neutrons

Explanation:

Mercury has an atomic number of 80. The atomic number (Z) represents the number of protons. Then,

Z = p⁺ = 80

Mercury has a mass number of 200. The mass number (A) represents the sum of protons and neutrons. Then,

A = p⁺ + n° = 200

We can establish that,

A = Z + n°

n° = A - Z

n° = 200 - 80 = 120

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

c.

explanation: