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Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. This includes ions as well as neutral atoms and, unless otherwise stated, for the purposes of this discussion it should be assumed that the term atom includes ions.

4
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Colour is a biological/mental phenomenon, not a physical one. This is nicely illustrated by the colour pink, or, the fact that red light and blue light together make pink light: The primary colour …
answered Jan 24 '17 by spraff
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If you shine white light through a gas, electrons can absorb sufficiently energetic photons to reach higher excited states. This produces gaps in the spectrum and it's how Helium was discovered. So go …
asked Apr 6 '16 by spraff