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Atom Work

Science

WordDefinition
Element A pure substance that cannot be seperated or broken down into simpler substances by physical or chemical means
Compound a pure substance composed of two or more elements that are chemically combined
Minture 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 positivley charged perticles of the nucleus the number of protons in a nucleus is the atomic number, which determines the identy of an element
electron the negativley charged perticles found in all atoms; electons are involved in the formation of chemical bonds
neutron the perticles 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 ut have different numbers of neutrons
valence electron the electrons in the outermost enerty leven of an atom; thses electrons are involved in forming chemical bonds
John Dalton Atomic Theory
J.J. Thomson small perticles in an atom
Ernest Rutherfor positive charged nucleus. atom mostly empty space electrons travel around nucleus
Niels Bohr electons travel in clouds
Democritus 1st to come up wth the idea of atom
Dmitri Mendeleev Father of Periodic Table, arrange elements by atomic mass
Henry Moseley rearranged periodic table by atomic number
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