Potassium chromate, · Potassium chromate is the inorganic compound with the formula (K2CrO4). This yellow solid is the potassium salt of the chromate anion. It is a common laboratory chemical, whereas sodium chromate is important industrially.economic geology, · WordNet the branch of geology that deals with economically valuable geological materials of or relating to the science of economics; "economic theory" of or relating to an economy, the system of production and management of material wealth; "economic growth ...Chromium, · Chromium is extremely hard, and is the third hardest element behind carbon and boron.Its Mohs hardness is 8.5, which means that it can scratch samples of quartz and topaz, but can be scratched by corundum.Chromium is highly resistant to tarnishing, which makes it useful as a metal that preserves its outermost layer from corroding, unlike other metals such as copper, magnesium, and aluminium.
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