atomic numbers

Element identity values

Atomic numbers identify chemical elements by the count of protons in their nuclei.

Hydrogen has atomic number 1, helium 2, carbon 6, uranium 92.

The periodic table arranges elements by atomic number, which determines an element's chemical properties and its place in the sequence of known matter.

protonPositive nuclear particle
neutronUncharged nuclear particle
nucleusCentral controlling part
hydrogenSimplest atomic element
electronNegative subatomic particle

electron shells · valence electrons · element · isotope · physics · chemical symbol · chemistry · periodic table · integer · chemical properties · electronegativity · lanthanides · alkali metals · actinides · metalloids · noble gases · transition metals · halogens

Opposites

atomic property type

atomic numbersatomic mass

Weighted average of isotopes

atomic weight · molar mass

scale of description

atomic numbersmolecular weight

Total mass of atoms

molecular formula · Avogadro's number

scale of measurement

atomic numbersmolecular weight

Total mass of atoms

molar mass · density · volume

Family

atomic, number, atom, atoms, atomize, atomized, atomizer, atomization, atomism

Familiarity: Top 200,000
Profile: Known to kids · Used worldwide · Timeless · Rated G