QMRP is an acronym for Qualified Mental Retardation Professional. This term was first used in federal standards developed in the late 1970s and early 1980s for intermediate care facilities for the developmentally disabled (ICF/DD).
Physical properties. Calcium is a fairly soft metal with a shiny silver surface when first cut. The surface quickly becomes dull as calcium reacts with oxygen to form a coating of white or gray calcium oxide. Calcium's melting point is 850Â°C (1,560Â°F) and its boiling point is 1,440Â°C (2,620Â°F).
Calcium is a chemical element with symbol Ca and atomic number 20. An alkaline earth metal, calcium is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust and the third most abundant metal, after iron and aluminium. The most common calcium compound on Earth is calcium carbonate, found in limestone and the