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Atom Works

Words and Definitions

WordDefinition
Element a pure substance that cannot be separated or broken down into simpler substances by physical or chemical bonds
Compound a pure substacne composed of two or more elements that are chemically combined
Mixture a combination of two or more substances that are not chemically combined
Atom the smallest particle into which an element can be divided and still retain all of the properties of that element
Proton the positively charged particles of the nuclews; the number of protons in a nucleus is the atomic number, which determines the identity of an element
Electron the negatively charged particles found in all atoms; electrons are involved in the formation of chemical bonds
Neutron the particles of the nucleus that have no charge
Periodic having a regular, repeating pattern
Periodic Law a law that states that the chemical and physical properties of elements are periodic functions of their atomic numbers
Atomic Number the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
Atomic Mass the weighted average of the masses of all the naturally occurring isotopes of an element
Isotope atoms that have the same number of protons but have different numbers of neutrons
Valance Electron the electrons in the outermost energy level of an atom; these electrons are involved in forming chemical bonds
John Dalton Atomic Theory
J.J. Thomson Small particles in atom
Ernest Rutherford positive charged nucleus, atom mostly empty space electrons travel around nucleus
Niels Bohr electrons travel in clouds
Dmocritus 1st to come up with idea of atom
Dmitri Mendeleev Father of Periodic Table, arrange elements by atomic mass
Henry Moseley Rearranged Periodic Table by atomic number
Created by: pinoymonkey
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