BSC 2010C Study Guide - Quiz Guide: Directional Selection, Chromosome, Stabilizing Selection
Document Summary
The atomic number of an atom is its number of protons. The mass number of an atom is its number of protons + neutrons. Isotopes of an atom are atoms that have the same atomic number but a different mass number. Hydrogen, atomic # 1, mass # 1 vs. deuterium, atomic # 1, mass # 2. Radioactive isotopes have nuclei which spontaneously decay, ejecting particles and releasing energy. Chapter 3 ph is the negative log of the h ion concentration. ph generally declines as h+ ions increase and inclines as h+ ions decrease. The ph scale runs from 0 to 14. Acids are anything below 7 and increase h+ concentration. Bases are anything above 7 and decrease the h+ concentration. The ph scale is logarithmic, meaning that the difference between ph 5 and ph 6 is 10x whereas the difference between ph 4 and ph 6 is 100x.
