ERSC 3V93 Lecture Notes - Lecture 23: Positron, Bohr Model, Atomic Number
29 Apr 2016
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Document Summary
Measure naturally occurring radioactivity in the form of rays. Most radiation comes from mineral species containing radioactive isotopes of potassium (k), Passive geophysical method, normally run with airborne magnetic survey. Bohr model: central nucleus made of neutrons + protons, surrounded by a # orbital electrons = to # protons. An atom that contains = # of protons + electrons electrically neutral. The # of protons/electrons in atom = element"s atomic number (z): defines its chem properties + its place in periodic table. The # of neutrons in nucleus of atom = atom"s neutron number (n) Total # of protons + neutrons (z+n) in nucleus = atom"s mass number (a) Atoms of same element that have different n = isotopes + identified by their a. Example: u contains 92 protons, but can have. + spontaneously emit radiation as part of their transformation more stable, non radioactive state.
