How many protons, electrons, and neutrons does a neutral atom of an element with atomic number 48 and mass number 120 contain?
The element is characterized by the number of protons, massive, positively charged nuclear particles. Here
The mass of an atom is the sum of massive nuclear particles, protons (as above), and neutrons, neutrally charged, massive nuclear particles. Here the number of neutrons
In the neutral element, if there are
I could describe the element as