Definition, Meaning & Synonyms
atomic-number
noun
/əˈtɒmɪk ˌnʌmbər/
Definition
The atomic number is a fundamental property of an element that indicates the number of protons found in the nucleus of its atoms.
Examples
- The atomic number of hydrogen is 1, meaning it has one proton in its nucleus.
- Sodium has an atomic number of 11, which signifies it has 11 protons.
- By knowing the atomic number, one can identify the element on the periodic table.
Meaning
It determines the chemical properties of an element and its position in the periodic table. The atomic number is always a whole number and is unique to each element.
Synonyms
- Element number
- Proton number
