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Ch. 12&13 vocab

ch 12&13 vocab

WordDefinition
John Dalton Atomic theory
J.J. Thompson 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 the idea of an atom
Dmitri Mendeleev Father of perdiodic table. orange elements by atomic mass
Henry Mosely Rearaanged periodic table by atomic number
Element A pure substance that can't be broken down physically or chemically
Compound two or more elements combined chemically
Mixture a combination of two or more substances that are not chemically combined
atom the smallest particle into which and element can be divided and still retain all the properties of that element
protons the positively charged particles of the nucleus; 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; invovled in the fromation of of chemical means
neutrons 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 if the elements are periodic functions of their atomic numbers
atomic number he number of protons in the nucleus of an atom; the same for all atoms of an element
atomic mass the weighted average of the masses of all the naturally occuring istopes of an element
isotope atoms that have the same number of protons but have different numbers of of neutrons
valence electron the electrons in the outermost energy level of an atom; these electrons are involved in forming chemical bonds
Created by: k.a.s.
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