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The Periodic Table
| Question | Answer |
|---|---|
| Mendelevs periodic law | when elements are ordered in increasing atomic weights, their properties recur periodically |
| Atomic Number | the atomic number of an atom is the number of protons in the nucleus of that atom |
| Modern periodic law | when elements are ordered in increasing atomic numbers, their properties recur periodically |
| Difference between Mendeleev's and Moseley's tables | ordered by atomic weight/ number - 60 elements approx/over 100 elements - Gaps for undiscovered elements/no gaps - transition metals not separate/transition metals have a seperate block |
| Mass number | Sum of the protons and neutrons in the nucleus of an atom |
| Isotopes | Atoms of the same element with the same atomic number but different mass numbers due to different amounts of neutrons |
| Relative atomic mass | Average of the mass numbers of the isotopes of an element. taking their abundances into account. relative to 1/12 mass of the carbon 12 isotope |
| electronic configuration | shows the arrangement of electrons of an element |
| Aufbau principle | when building up the electronic configuration of an atom in its ground state, the electrons occupy the lowest energy levels available |
| Hunds rule of maximum multiplicity | When two or more orbitals of equal energy are available, the electrons occupy them singularly before pairing up |
| what two elements grant an electron to the outer orbital | copper chromium, |
Created by:
Miki_Szn
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