| A | B |
|---|
| atom | smallest particle of an element that has properties of the element |
| atomic mass | the mass of avogadro's number of atoms |
| atomic number | number of protons in the nucleus |
| mass number | number of protons + neutrons in the nucleus |
| mole | contains Avogadro's number of particles |
| Avogadro's Number | 6.02 x 10e23 |
| electron | negatively charged particle in the nucleus |
| istotopes | atoms of the same element with different number of neutrons |
| wavelength | distance between two corresponding points on a wave |
| crest | top of a wave |
| trough | bottom of wave |
| energy level | average distance from nucleus that electron is |
| ground state | lowest energy state possible for an electron |
| excited state | electron absorbs energy and moves farther from the nucleus |
| electron configuration | symbolic representation of electrons in orbitals |
| Quantum numbers | Shrodinger's variables that describe location of |
| sublevels | s, p, d. and f |
| orbitals | region of space where an electron is likely to be |
| proton | positively charged particle in nucleus |
| nucleon | particle in the nucleus |
| Hund's rule | Electrons remain unpaired before they are paired. |
| Pauli's Exclusion Principle | No two electrons in the same atom have the same 4 quantum numbers. |
| Schrodinger | developed Quantum theory |
| Bohr | developed planetary model |
| Rutherford | Discovered nucleus & atom mostly empty space |
| Thomson | discovered electron: proposed plum pudding model |
