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Atom words

atom defintions

worddefinition
element a puresubstance that can not be broken chemicaly or phyisacl means
compound a pure substance coposed of two or more elements that are chemically combined
mixture a combination of two or more substaces not combined chemically
atom the smallest particle into which an element can be divided and still retain all of the properteis of that element
proton the positively charged particles of the nucleus
electron the negativly charged particles found in the nucleus
neutron the particles of the nucleus that have no charge
periodic law a law that states that the chemical and physical properties of elements are periodic functions
atomic numbers the number of protrons in the nucleus
atomic mass the weighted average the masses of all naturaly occuring isotopes of an element
isotope atoms that have the same nuber of protrons but difrent number of nutrons
valence electrons the electrons in the outermost enrgy level of the atom
john dalton atom theory
JJ Thomson small particles in atom
ernest rutherford positive charged nucleus, atom mostly empty space electrons travel around nucleus
niels bohr electrons travel in clouds
democritus 1st to come up with idea of atom
dmiti mendelev father of the periodic table, arrange elements by atomic mass
henry moseley reaganged periodic table ny atmoic number
Created by: tom2the4th
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