What do we call an atom that has 14 positively-charged, massive nuclear particles, and 15 massive, neutrally-charged nuclear particles?

1 Answer
Oct 23, 2017

Well, its mass is #29*"amu"#, and we call it an isotops, i.e. the #""^29Si# isotope...

Explanation:

The element is neutral, (why?), and there are 14 protons, and 15 neutrons. A single atom of this stuff has a mass of #29*"amu"#; we can ignore the mass of the electrons, because these are not massive particles.

And further we can specify the element, and the isotope....we got #""^29Si#. How do we know this?