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Atoms and Elements

TermDefinition
Atom The basic particle from which all elements are made
Nucleus The very small center core of an atom. It is made up of smaller particles called protons and neutrons
Neutron A small particle in the nucleus of an atom, with no electrical charge.
Proton A positively charged particle that is part of an atom’s nucleus
Electron A negatively charged particle that orbits the nucleus of an atom.
Electron Cloud A sphere shaped area around the nucleus where the electrons can be found.
Atomic Number The number of protons that are in the nucleus.
Isotope Atom with the same number of protons and a different number of neutrons.
Atomic Mass The sum of the protons and neutrons in the nucleus of an atom.
Dmitri Mendeleev Russian scientist who discovered a set of patterns
Average Atomic Mass The average mass of all the isotopes of that element.
Period (on the Periodic Table) The rows, from left to right on the Periodic Table
Groups (on the Periodic Table) Elements in a column on the Periodic Table, also known as families
Created by: SelmaMS