Menu
Home Explore People Places Arts History Plants & Animals Science Life & Culture Technology

Periodic table

Atomic mass
Rest mass of an atom in its ground state
Atomic number
Number of protons found in the nucleus of an atom
Atomic radius
Any measure of the size of atoms
Block (periodic table)
Set of adjacent groups
Electron affinity
Amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion
Electronegativity
Tendency of an atom to attract a shared pair of electrons
Group (periodic table)
Column of elements in the periodic table of the chemical elements
Heavy metals
Loosely defined subset of elements that exhibit metallic properties
Ionization energy
Minimum amount of energy required to remove an electron from an atom or molecule in the gaseous state
Main-group element
A set of elements consisting of Groups 1, 2 and 13 to 18 in the periodic table
Mass number
Number of heavy particles in the atomic nucleus
Metalloid
Chemical element with relatively weak metallic and nonmetallic properties
Native metal
Metal that is found in its metallic form, either pure or as an alloy, in nature
Nonmetal
Chemical element that mostly lacks the characteristics of a metal
Period (periodic table)
A method of visualizing the relationship between elements
Periodic table
Tabular arrangement of the chemical elements ordered by atomic number
Periodic trends
Specific recurring patterns that are present in the modern periodic table
Post-transition metal
Category of metallic elements
Relative atomic mass
Type of atomic measurement
Standard atomic weight
Relative atomic mass as defined by IUPAC (CIAAW)
Template Attribute Language
Template language
Toxic heavy metal
Category of substances