Chapter 4 Vocabulary

Front

the dense, positively charged mass located in the center of an atom

Back

nucleus

Front

a positively charged subatomic particle that is found in the nucleus of an atom

Back

proton

Front

a negatively charged subatomic particle that is found in the space outside the nucleus of an atom

Back

electron

Front

a neutral subatomic particle that is found in the nucleus of an atom

Back

neutron

Front

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

Back

atomic number

Front

The sum of the number of protons and neutrons in the nucleus of an atom.

Back

mass number

Front

Atoms of a given element that have different numbers of neutrons and different mass numbers.

Back

isotopes

Front

The possible energies that electrons in an atom can have.

Back

energy levels

Front

A visual model of the most likely locations for the electrons in an atom.

Back

electron cloud

Front

a region of space around the nucleus where an electron is likely to be found

Back

orbital