table+of+contents
131Group (periodic table) — The periodic table of the chemical elements. The columns represent the groups In chemistry, a group (also known as a family) is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table,… …
132Mathematical table — Before calculators were cheap and plentiful, people would use mathematical tables lists of numbers showing the results of calculation with varying arguments to simplify and drastically speed up computation. Tables of logarithms and trigonometric… …
