Question

If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?

a.54
b.27
c.100
d.108

Answer 1

To find the number of neutrons in xenon with an atomic number of 54 and a mass number of 108, subtract the atomic number from the mass number, which gives you 54 neutrons.The correct answer is b. 54.

Step-by-step explanation:

If xenon has an atomic number of 54 and a mass number of 108, to find the number of neutrons in a xenon atom, we will have to subtract the atomic number from the mass number.

The atomic number of an element tells us the number of protons in one atom of that element.

Because the mass number represents the total number of protons and neutrons in the atom's nucleus, to find the number of neutrons, we can use the formula:

Number of neutrons = Mass number - Atomic number

Number of neutrons = 108 - 54 = 54 neutrons.

Therefore, the correct answer is b. 54.