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modern atom


smallest part of an element


has a negative charge and a mass of 9.11 x 10-31 kg


revolves around the nucleus in fixed orbits

electron shells

are named alphabetically starting with k-shell to q-shell


has a positive charge and a mass of 1.673 x 10-27 kg


is located in the nucleus with neutrons


no charge and a mass of 1.675 x 10-27 kg


center of atom


particles in the nucleus


protons + neutrons


atom having specific number of protons and neutrons


separated into four groups depending on subatomic particle configuration


two or more nuclides; same mass number; different atomic numbers; belong to different elements


two or more nuclides; different atomic numbers; same number of neutrons; belong to different elements


two or more nuclides; same atomic number; same mass number; different value of energy content; belong to same element


exists in pairs; are radioactive; only difference is the nuclear energy content


two or more nuclides; sam atomic number; different mass number; belong to same elements


human body cannot distinguish between one or another of the same element

bohr atom

considered a miniature solar system

bohr atom

small, dense, positively charged nucleus surrounded by negatively charged electrons revolving in fixed orbits around the nucleus

atomic number

number of protons in an atom

atomic number

represented by letter "Z" and determines identity of element

atomic mass number

represent by letter "A" and equal to number of nucleons in atom

atomic mass number

weight of combined protons and neutrons in nucleus

atomic weight

1/12 the mass of a carbon 12 nucleus

atomic mass number = atomic number + neutron

A = Z + N

electron binding energy

strength of attachment of an electron to the nucleus

electron binding energy

strongest at the K-shell with the designation of Eb

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