Chemistry - Chapter 4 Vocab (Pearson)

Front

Negatively charged subatomic particles.

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

Subatomic particles with no charge.

Back

Neutrons are subatomic particles found in the nucleus of an atom and have no electric charge.

Front

A glowing beam that traveled from the cathode to the anode.

Back

A cathode ray is a stream of electrons observed in vacuum tubes.

Front

The total number of protons and neutrons in an element.

Back

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

Front

Atoms that have the same number of protons but different numbers of neutrons.

Back

Isotopes are variants of a particular chemical element that differ in neutron number.

Front

The center of an atom, containing protons and neutrons.

Back

The nucleus is the dense central core of an atom.

Front

The number of protons in the nucleus of an atom.

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Atomic number defines the identity of an element and determines its position in the periodic table.

Front

The weighted average of the masses of an element's isotopes.

Back

Atomic mass is the average mass of an atom of an element, measured in atomic mass units (amu).

Front

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

Back

An atom is the basic building block of matter.

Front

A particle with a positive charge found in the nucleus of an atom.

Back

Protons are positively charged subatomic particles that contribute to the atomic mass.