Created By : Rina Nayak

Reviewed By : Phani Ponnapalli

Last Updated : Apr 03, 2023

Our Atom Calculator displays the components of an atom based on the atomic number. This tool will do all calculations faster and gives the answer in a fraction of seconds. Simply enter the atomic number, mass number and charge of the atom in the input boxes and press the calculate button to see the no of protons, neutrons and electrons values within no time.

Atomic Number
Mass Number
Charge

### How to Calculate Number of Protons, Neutrons & Electrons?

Go through the simple steps to compute the atomic components from the atomic number, mass.

• Check the atomic number, mass number and charge.
• The subtraction of an atomic number from the mass number is the number of neutrons.
• The atomic number is equal to the number of protons.
• Subtracting the charge from the atomic mass gives the number of electrons.

### Define Atom, Atomic Number and Atomic Mass

Atom is defined as the basic building blocks of matter. It is the smallest constituent unit of matter that posses the properties of the chemical element. Atom components are positively charged protons, negatively charged electrons orbiting the nucleus and electrically neutral neutrons in the nucleus. Atoms are electrically neutral as they have an equal number of protons and electrons.

If an atom has an unequal number of protons and electrons, then it has an electrical charge. If an ion has more protons compared to electrons, it is positively charged and called a cation. Otherwise, it is negatively charged and is called an anion.

Atom is uniquely identified with the atomic number. It is the number of protons present in the nucleus. For uncharged atoms, the atomic number is equal to the number of electrons.

The number of protons and neutrons combined give the mass number of an atom. As both protons and neutrons are present in the atom nucleus, they are together called nucleons.

### Atom Components Formulas

The different components of an atom are a number of protons, neutrons and electrons. The formulas to calculate them are listed here:

Number of Protons = A

Number of Neutrons = M - A

Number of Electrons = M - C

Where,

M is a Mass Number

A is an Atomic Number

C is a Charge

Example:

Question: Calculate the number of protons, electrons and neutrons of an atom. If the atomic number is 11, the mass number is 23 and the charge is 5.

Given that

Mass number M = 23

Atomic Number A = 11

Charge C = 5

Number of Protons = A = 11

Number of Neutrons = M - A

= 23 - 11 = 12

Number of Electrons = M - C

= 23 - 5 = 18

Therefore, the number of protons, neutrons and electrons in the atom are 11, 12 and 18 respectively.

Stay tuned to our website Chemistrycalc.Com to learn more chemistry concepts. Make use of these instant calculator tools to find the accurate answer easily in a fraction of seconds.

### Frequently Asked Question's on Atom Calculator

1. What is an atom definition?

An atom is the smallest unit of matter that has the properties of an element. A typical atom has a nucleus and electron cloud. The components of an atom are positively charged protons, electrically neutral neutrons in the nucleus and negatively charged electrons that are orbiting in the nucleus.

2. How to find a number of protons, neutrons and electrons?

• The number of protons in the atomic number of an atom.
• The number of neutrons is obtained by subtracting the atomic number from the mass number.
• Subtract charge from the mass number of an atom to get the number of electrons.

3. Define the atomic mass?

The atomic mass is the mass of an atom that includes a number of protons and a number of neutrons. One atomic mass unit is equal to 1/12 the mass of a carbon-12 atom. The atomic mass formula is atomic mass = number of protons + number of neutrons.

4. How to use Atom Calculator?

This free calculator tool is used to find the atom components. Just provide details in the input fields like atomic number, mass number, charge and hit the calculate button. In the output section, you can find atomic composition including the number of electrons, number of neutrons and number of protons. 