Periodic Table

Front

The basic structural unit of matter

Back

atom

Front

a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means

Back

element

Front

the positively charged subatomic particle contained in the nucleus of an atom

Back

proton

Front

A subatomic particle, contained in the nucleus of an atom, having the same mass as a proton but no electrical charge.

Back

neutron

Front

a negatively charged subatomic particle that orbits the nucleus of an atom

Back

electron

Front

An arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column and properties repeat from row to row.

Back

Periodic Table of Elements

Front

one or two letters that represent the name of an element

Back

element symbol

Front

A unique number for each element that equals the number of protons in an atom of that element.

Back

atomic number

Front

The mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom.

Back

atomic mass

Front

A grouping of elements based on similar properties, arranged by columns in the periodic table; also known as a group.

Back

family