How do you figure out the number of protons neutrons and electrons in an atom?

Answer 1

its simply just the mass. for every amount of protons theres a nuetron, like in hydrogen theres only 1 proton and no nuetrons because its mass shows as 1. Also the electrons is not included in the mass due to the fact of they are so small. Lets say an electron is the size of an orange, a proton would be a football stadium. So if an object has a mass of 50 it has 25 protons and 25 nuetrons usually. so really its basically thenumber divided by 2.

Answer 2

The number of protons in an atom is equal to its atomic number. Neutrons can be calculated by subtracting the atomic number from the Atomic Mass. Electrons are equal to the number of protons in a neutral atom.

Answer 3

Look up the atomic number in any Periodic Table (of the Elements). That is the number of electrons or protons -- they are equal in number. Neutrons are more difficult, since there can be more than one isotope, and the atomic weight represents the average of the masses of commonly- found isotopes. Normally the number of neutrons doesn't matter. But, if you need the exact number of neutrons, you must specify a particular isotope, then subtract the atomic number from the mass number (for that specific isotope).