Unit 1: Modern Atomic Theory

These flashcards cover key concepts and terminology related to Modern Atomic Theory.

Atomic mass unit (amu)

A unit of mass used to express atomic and molecular weights.

Gamma radiation

A type of high-energy radiation often associated with radioactive decay.

Beta radiation

A form of radiation consisting of beta particles, which are high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei.

Alpha radiation

A type of radiation that consists of alpha particles, which are composed of two protons and two neutrons.

Neutron (n0)

A subatomic particle found in the nucleus of an atom, possessing no electric charge.

Proton (p+)

A positively charged subatomic particle found in the nucleus of an atom.

Electron (e-)

A negatively charged subatomic particle that orbits the nucleus of an atom.

Modern Atomic Theory

A model that describes the nature of atoms, including their composition and behavior.

Element symbol Nb

The chemical symbol for niobium, a transition metal.

Isotopes

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