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PhysSci-Unit 2

Ch16

TermDefinition
atom the smallest particle of an element that retains all the properties of that element
nucleus location of protons and neutrons in a atom
protons positively charged particles in the nucleus, also the atomic number on the periodic table
neutrons neutral particles in the nucleus of atoms
quarks small particles that make up protons and neutrons
electron cloud model the most accurate and current model of the atom
Bohr model a useful model of the atom that shows electrons in rings or energy shells around the nucleus
atomic mass number the sum of protons and neutrons located in the nucleus of an atom
atomic number the number of protons in an atom
isotope atoms of the same element with different numbers of neutrons and thus different masses
ion an atom that has lost or gained electrons and now has a positive or negative charge
period a row on the periodic table
group a column on the periodic table
metals elements located in groups 1 and 2 on the periodic table
transition metals elements located in the center of the periodic table
non metals elements located on the far right side of the periodic table, including the noble gasses and hydrogen
metalloids elements located between the transition metals and non metals along the zig-zag line on the periodic table
energy levels locations occupied by electrons in the electron cloud
valence electrons the electrons located in the outer most energy level
Created by: lpgullett
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