atomic mass unit (amu)

Defined as one-twelfth the mass of a carbon-12 atom. Carbon-12 is a standard for measurement of amu.

The weighted average mass of the isotopes of that element.

A process where some substances spontaneously emitted radiation. Ex: Radium

The rays and particles emitted by the radioactive material.

A reaction that involves a change in an atom’s nucleus

Unstable nuclei lose energy by emitting radiation in a spontaneous process.

The radiation that was deflected toward the negatively charged plate.

Contains two protons and two neutrons, and thus has a 2+ charge, which explains why they are attracted to the negatively charged plate

Shows the atomic numbers and mass numbers of the particles involved. The mass number is conserved in nuclear equations.

The radiation that was deflected toward the positively charged plate.

An electron with a 1- charge. The negative charge of the beta particle explains why it is attracted to the positively charged plate

A high-energy radiation that possesses no mass . Because they are neutral, they are not deflected by electric or magnetic fields. They usually accompany alpha and beta radiation, and they account for most of the energy lost during radioactive decays.

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Chemistry Vocab 6

Chemistry Vocab 6 Chapter 4 section 4.3 and 4.4

Term	Definition
atomic number	The number of protons in an atom.
isotope	Atoms with the same number of protons but different numbers of neutrons.
mass number	The sum of the atomic number (or number of protons) and neutrons in the nucleus.
atomic mass unit (amu)	Defined as one-twelfth the mass of a carbon-12 atom. Carbon-12 is a standard for measurement of amu.
atomic mass	The weighted average mass of the isotopes of that element.
radioactivity	A process where some substances spontaneously emitted radiation. Ex: Radium
radiation	The rays and particles emitted by the radioactive material.
nuclear reaction	A reaction that involves a change in an atom’s nucleus
radioactive decay	Unstable nuclei lose energy by emitting radiation in a spontaneous process.
alpha radiation	The radiation that was deflected toward the negatively charged plate.
alpha particle	Contains two protons and two neutrons, and thus has a 2+ charge, which explains why they are attracted to the negatively charged plate
nuclear equation	Shows the atomic numbers and mass numbers of the particles involved. The mass number is conserved in nuclear equations.
beta radiation	The radiation that was deflected toward the positively charged plate.
beta particle	An electron with a 1- charge. The negative charge of the beta particle explains why it is attracted to the positively charged plate
gamma ray	A high-energy radiation that possesses no mass . Because they are neutral, they are not deflected by electric or magnetic fields. They usually accompany alpha and beta radiation, and they account for most of the energy lost during radioactive decays.

Created by: Mr. Bryant

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