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chem unit 2

chem midterm

TermDefinition
alkali metals group 1
alkaline earth metals group 2
halogens group 17
noble gases group 18
transition metals groups 3-12
periods indicates the energy level and the approx. size of an atom
protons in the nucleus, +1 charge
neutrons in the nucleus, no charge
electrons surrounding the nucleus, -1 charge
isotopes atoms of the same element that have different masses
JJ Thomson showed that atoms conisist of smaller particles (electrons) thru his experiment with cathode ray tubes
Thomson's plum pudding model neg. charged particles in a pos. charged sphere
Ernest Rutherford discovered that the atom has a small, dense, pos. charged nucleus
Bohr studied light emission of hydrogen atoms
Schrodinger proposed that electrons behave according to mathematical wave functions
atomic orbitals clouds of electron density, based on mathematical probabilities
valence electrons electrons in the outermost shell of the atom
which group has a full outer shell? noble gases
Created by: elenarrogers
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