CHE: Chapter 4 Structure of the Atom

Front

What is a reaction that involves a change in the nucleus of an atom?

Back

Nuclear reaction.

Front

What is the weighted average mass of the isotopes of an element called?

Back

Atomic mass.

Front

What is a particle with two protons and two neutrons, with a 2+ charge, equivalent to a helium-4 nucleus?

Back

Alpha particle.

Front

What is the spontaneous process in which unstable nuclei lose energy by emitting radiation?

Back

Radioactive decay.

Front

What is a neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton?

Back

Neutron.

Front

What is the center of an atom called, containing protons and neutrons?

Back

Nucleus.

Front

What is the term for the number of protons in the nucleus of an atom?

Back

Atomic number.

Front

What is the term for the average mass of an atom of an element, taking into account the relative abundance of its isotopes?

Back

Atomic weight.

Front

What type of radiation consists of high-energy electromagnetic waves?

Back

Gamma rays.

Front

What is the term for the process by which an unstable atomic nucleus loses energy by emitting radiation?

Back

Radioactivity.