Chapter 9 Understanding the Atom Vocab Flashcard

Front

A particle with one negative charge (-1)

Back

Electron

Front

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

Back

Mass Number

Front

The average mass of the element's isotopes, weighted according to the abundance of each isotope

Back

Average Atomic Mass

Front

An atomic particle that has one positive charge (+1)

Back

Proton

Front

An area around an atomic nucleus where an electron is most likely to be located

Back

Electron Cloud

Front

The center of an atom, containing protons and neutrons

Back

Nucleus

Front

The number of protons in the nucleus of an atom, which determines the element's identity

Back

Atomic Number

Front

A charged particle that has either lost or gained one or more electrons

Back

Ion

Front

Particles in the nucleus of an atom that have no charge

Back

Neutron

Front

The smallest unit of an element that retains the properties of that element

Back

Atom