NATS 1745 Lecture Notes - Lecture 14: Electronvolt, *Star, Solar Mass
8 Sep 2017
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In order to answer this, we need to understand atoms. Dark line = absorption eg stars. Bright line = emission eg nebulae. Much like the solar system, each electron has a specific orbit, with one a little bit further out than the last. Ones furthest from nucleus have higher energies. **quantum mechanical model: (go back to lecture for more info) *p and n make up the nucleus. Each type of atom (or each element) has a specific number of p, n, and e- ^there is one uncommon type of hydrogen atom called deuterium (has 1 p, 1 n, 1 e-) ^less than 1% of all hydrogen as a neutron. Each type of atom is uniquely specified by its number of protons. Whole periodic table is built of diff types of atoms defined by its number of protons. In a neutral atom, the number of p and e- are equal.
