1.25 Astro 1 - Astro 1 Section 1 Professor Brandt Monday...

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Astro 1 Section 1 Professor Brandt Monday January 25th 1999 Announcements: Lecture notes: Class 7 Title of class is chemistry from afar This seems odd this is not a chemistry course but astronomers do use chemical clues to learn what things are made of. For example we can learn what elements are in a distant star just by studying its spectrum First we have to explain the atomic model atom = building block of matter composed of protons neutrons and electrons atom not indivisible = made of subunits consider H atom - made of 1 proton and 1 electron protons = positively charged particles in the nucleus of an atom. The number of protons determines the type of chemical element electrons = very light particles in "orbit" around nucleus - negatively charged by same amount that proton is positively charged not a simple orbit - really quantum mechanically "fuzzy". can't pin down precise position atoms are small = 5E-9cm More generally atoms have nuclei made of protons and neutrons with >1 electron
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