How many neutrons in an #""^238U# atom?

1 Answer
Sep 11, 2017

Answer:

In #""^238U#........?

Explanation:

Well, for a start, the number of nuclear protons is #92#; i.e. for uranium, #Z,"the atomic number"=92# this is what defines uranium as an element.

Now the mass number is #238#, and therefore there are #238-92=146* "neutrons"#.

And finally the number of electrons, which is easy given what we know. We know we deal with a NEUTRAL element, and if #Z=92#, the positive charge provided by the protons must be matched by an equal number of electrons, conceived to whizz around the nuclear core; i.e. there are 92 electrons..... The fissile isotope of uranium is #""^235U#; how many neutrons in this nuclide?