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Final part 1

Hund? Electrons must fill orbitals singly before they pair.
Mendeleev? Arranged the elements in his periodic table in order of increasing ATOMIC MASS.
Aufbau? Electrons occupy the orbitals of lowest energy first.
Thompson? BUilt the plump-pudding model. Electrons should be spaced out in a positive charged place.
Rutherford? discovered the nuclues.
Dalton? Discovered the 1st scientific atomic theory.
Chemical Reaction? when ONE OR MORE chemicals combine & form new chemicals.
Chemical Properties? What will this react with?
Physical Properties? ~Density~solubility~boiling point~ Atomic #~Color~smell ~texture~taste~ melting point
Law of Conservation of Mass? Matter can neither be created nor destroyed.
Observations? info. obtained through the senses. observation in science often involves a measurement.
Hypotheses? a proposed explanation for an observation.
Experiment? a repeatable procedure that is used to test a hypotheses.
Average Atomic MAss? The number at the bottom of the box (periodic table) Weighted Average of all of the isotopes of the element, (has decimal points)
Weighted Average? formula... M1 (% of a decimal) + M2 (%) + M3 (%)any weight left over from protons goes to the nuetrons.
Electron Configuration? Arrangement of Electrons of an atom in its ground state into various orbitals around the nuclei of atoms.
Created by: Celinaaa