Chemistry

Atom Calculator

Find protons, neutrons and electrons of an atom or ion.

Calculated Output

Protons 11

Neutrons 12

Electrons 11

Formula: protons = Z ; neutrons = A − Z ; electrons = Z − charge

Step-by-Step Breakdown

1. Values used:

2. Atomic number (Z) = 11

3. Mass number (A) = 23

4. Charge = 0

6. Protons = 11

7. Neutrons = 12

8. Electrons = 11

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The math behind it

Protons = atomic number; neutrons = mass number − atomic number; electrons = protons − charge.

Na (Z 11, A 23) → 11 p, 12 n, 11 e⁻.

Ion charge?

A +1 ion has one fewer electron; a −1 ion has one more.