Front

Number of protons in an atom of an element.

Back

atomic number

Front

A particle with no electric charge.

Back

neutron

Front

Smallest particle of an element with its properties.

Back

atom

Front

Shiny elements that can be shaped.

Back

metals

Front

Gases that do not react readily with other elements.

Back

noble gases

Front

A particle with a positive charge.

Back

protons

Front

Elements with no shine and cannot be shaped.

Back

nonmetals

Front

Elements with properties of metals and nonmetals.

Back

semimetals

Front

Dense core of an atom.

Back

nucleus

Front

A particle with a negative charge.

Back

electron