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IB Chem 2 SL

proton positively charged nucleon of 1 amu
neutron neutral (no charge) nucleon of 1amu
electron negatively charged particle outside of the nucleus rounded to 0amu
Atomic number (Z) the number of protons in the nucleus of an atom. It is also known as the proton number.
Mass number (A) the sum of the number of protons and the number of neutrons in the nucleus of an atom.
isotope atoms of the same element with the same atomic number, but different mass numbers
radioisotope isotopes that have unstable nuclei and therefore emit radiation when then break up
convergence higher levels/shells get closer together
Lyman series Electrons moving back to first energy level - UV
Balmer series Electrons moving back to second energy level - visible
Paschen series Electrons moving back to third energy level - infrared
Aufbau principle Electrons fill orbitals of lower energy first
Hund's rule Electrons fill unoccupied orbitals first and spin in the same direction
Pauli exculsion principle Paired electrons have opposite spin
Created by: andrewweng0406



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