Its one of many diagnostic tests in and particularly good for identifying metallic minerals which tend to have a shiny metallic luster. The luster of a […]
The alkali metals all have similar properties to sodium. ##Na## has similar properties to the alkali metals which are ##Li## ##Na## ##K## ##Rb## ##Cs## and ##Fr##. […]
Three factors of equal importance and nearly simultaneous in the archaeological/anthropological sense (that is they were developed over a few centuries in various parts of the […]