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IB Chem 2 SL
Question | Answer |
---|---|
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. Same protons, difference neutrons. |
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 |