Chemistry Vocabulary

smallest unit of matter that can’t be broken down by chemical means

• element

• molecule

• atom

• electron

substance made up of atoms with same number of protons

• element

• molecule

• compound

• isotope

number of protons in the nucleus of each atom of an element

• atomic mass

• isotope mass

• atomic number

• symbol

number of neutrons and number of protons in the nucleus of an atom 

• atomic mass

• atomic number

• isotopes

• symbol

atoms of the same element with different number of neutrons

• atom

• element

• isotope

• compound

atoms that have lost or gained electrons and have a positive or negative charge

• ion

• atom

• isotope

• compound

a table of the chemical elements arranged in order of atomic number

• Punnett square

• data table

• table of ions

• periodic table

horizontal (left-to-right) rows of the periodic table

• period

• group

• matrix

• line

Vertical (up and down ) columns; numbered 1-18

• period

• group

• matrix

• line

solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity

• nonmetal

• metal

• metaloid

• gas