How many neutrons does Uranium-238 have if it has 92 protons?

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Answer 1 · 2018-04-08T07:15:10

See explanation.

The mass number is $238$ , so the nucleus has $238$ particles in total, including $92$ protons.

So to calculate the number of neutrons we have to subtract:

$238-92=146$

Answer: The atom has $146$ neutrons.

Answer 2 · 2018-04-08T09:35:30

$146$

The mass of uranium- $238$ is $238$ mass units. The total mass of an element is the sum of its protons and neutrons.

There are $92$ protons in this isotope, and its mass is $238$ , so that means that there are,

$238-92=146$ neutrons