Atomic Number
| Formula / Notation | Z = number of protons in nucleus |
|---|---|
| Also Known As | Proton number; nuclear charge (Z); atomic charge; Z number |
What is Atomic Number?
The atomic number (symbol: Z) is the number of protons found in the nucleus of an atom of a given element. It uniquely identifies each chemical element — no two elements have the same atomic number. In a neutral atom, the number of protons equals the number of electrons. The atomic number determines an element's position in the periodic table.
Formula & Notation
Other Names / Synonyms: Proton number; nuclear charge (Z); atomic charge; Z number
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The atomic number (symbol: Z) is the number of protons found in the nucleus of an atom of a given element. It uniquely identifies each chemical element — no two elements have the same atomic number. In a neutral atom, the number of protons equals the number of electrons. The atomic number determines an element's position in the periodic table.
Identifying elements; understanding electron configuration and periodicity; nuclear chemistry and physics; isotope notation (ᴬ_Z X); mass spectrometry interpretation; predicting chemical behaviour of elements
No hazard — a fundamental atomic property.
The formula or notation for Atomic Number is: Z = number of protons in nucleus