# How would you determine the number of protons or electrons in an atom?

## How would you determine the number of protons or electrons in an atom?

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.

How do you find the number of electrons in a positive atom?

The charge on the ion tells you the number of electrons. If the charge is positive, subtract that number from the atomic number to get the number of electrons. You have more protons. If the charge is negative, add the amount of charge to the atomic number to get the number of electrons.

### How is number of protons determined?

The number of protons is determined by the atomic number which can be found on the periodic table. The electrons are always the same as the protons in a neutral atom.

How do you determine number of electrons?

The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules.

1. The number of protons in the nucleus of the atom is equal to the atomic number (Z).
2. The number of electrons in a neutral atom is equal to the number of protons.

#### How are the number of protons and electrons in an atom determined?

A neutral atom has the same number of protons and electrons (charges cancel each other out). An ion has an unequal number of protons and electrons. If the charge is positive, there are more protons than electrons. If the charge is negative, electrons are in excess. You can find the number of neutrons if you know the isotope of the atom.

How do you find the number of neutrons in an atom?

Find the Number of Neutrons. To find the number of neutrons in an atom, you need to find the mass number for each element. The periodic table lists the atomic weight for each element, which can be used to find mass number, For hydrogen, for example, the atomic weight is 1.008.

## What happens to the number of electrons in an atom if it is neutral?

If the atom is neutral, the number of electrons will be equal to the number of protons. Remember! 1. Your mass number is the total number of neutrons and protons within the atom. 2. Your atomic number is the amount of protons within the atom.

How do you calculate the number of electrons in an ion?

To calculate the remaining number of electrons, you subtract the amount of extra charge from the atomic number. In the case of a positive ion, there are more protons than electrons.