## How do you find the protons neutrons and electrons of an element?

Explanation: You can simply subtract the atomic number from the mass number in order to find the number of neutrons. If the atom is neutral, the number of electrons will be equal to the number of protons.

## How do you find the number of neutrons without knowing the mass number?

The atomic mass is the weighted average mass of all the isotopes of an element. If we round off the atomic mass to the nearest whole number and subtract the atomic number from it, we get the number of neutrons. That is, number of neutrons = atomic mass (rounded to nearest whole number) – atomic number.

## How many neutrons are in an atom?

For example, silicon has 14 protons and 14 neutrons. Its atomic number is 14 and its atomic mass is 28. The most common isotope of uranium has 92 protons and 146 neutrons. Its atomic number is 92 and its atomic mass is 238 (92 + 146).

2.1 Electrons, Protons, Neutrons, and Atoms.

Elementary Particle | Charge | Mass |
---|---|---|

Proton | +1 | 1 |

Neutron | 1 | |

Electron | −1 | ~0 |

## How do you figure out the atomic number?

**To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:**

- number of protons = atomic number.
- number of electrons = atomic number.
- number of neutrons = mass number – atomic number.