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8th gr. Chemistry

8th Grade Chemistry Chapters 3 and 4 Vocab

Atom The smallest particle that can be considered an element.
Element A substance that cannot be broken down into any other substances by chemical or physical means.
Nucleus The central core of an atom which contains protons and neutrons.
Atomic Number The number of protons in the nucleus of an atom.
Atomic Mass The average mass of all the isotopes of an element.
Proton The positive (+) charged particles that are found in the nucleus of an atom.
Neutron A small particle in the nucleus of an atom, with NO electrical charge.
Electron The negatively (-) charged particle that moves around the outside of the nucleus of an atom.
Isotope An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
Ion An atom or group of atoms that has become electronically charged.
Valence Electrons The electrons that are in the highest energy level of an atom.
Malleable A material that can be hammered or rolled into flat sheets.
Luster The way a mineral reflects light from its surface. (Shiny)
Ductile A metal that can be pulled out into a long wire.
Created by: tpeterson280