![]() The Town submitted the adopted HEU to the California Department of Housing and Community Development (HCD). The Atherton City Council adopted the Town’s 2023-31 Housing Element Update (HEU) on January 31, 2023, following a year of community outreach, drafting and review. Toxicity: Dumping of calcium phosphide in water bodies harms the environment because they are quite toxic to aquatic life.Adopted by the City Council on January 31, 2023.It will tend to corrode any body part it comes in contact with. Corrosion: If calcium comes in contact with bodily moisture through skin contact or if swallowed, it will reach with water exothermically and cause corrosive irritation.Medicine: The calcium isotopic formation in urine or blood is useful in early detection of metabolic bone disease like osteoporosis.They are a relatively better replacement to the antimony-lead alloys but the calcium-lead alloys have risk of cracking so aluminium is also added to lower or prevent it. Batteries: The use of 0.1% calcium-lead alloys in automotive batteries leads to lower water loss and lower water discharging.The hydrogen from the calcium hydride is very easy to re-extract. It is relatively much easier to store the hydrogen in form of calcium hydride than a hydrogen gas. Storage: Calcium metal reacts with hydrogen to form calcium hydride.Reducing agent: Calcium metal is used for reduction of chromium, zirconium, thorium, and uranium.This improves the mechanical properties of the steel, its castability and cleanliness as well. Once they are formed, they give liquid lime aluminate and sulfide incision on steels. Calcium has a strong affinity to oxygen and sulfur, it reacts with them to produce its oxides and sulfides. Steel industries: Steel making finds the largest use for metallic calcium.Relevance in Chemical and Related Industries: Reduction: Commercially, the calcium metal is produced by the reaction of lime which is calcium oxide with aluminium at high temperatures.Since calcium ion has a large size, it is able to form coordination compound with high coordination numbers.Calcium combines with each halogen to form dihalides.When calcium is present in bulk it forms a hydration coating in presence of moist air and becomes less reactive.If calcium is finely divided, it spontaneously reacts to form nitrides.Calcium is reactive in nature and reacts with oxygen and nitrogen in air and forms a dark oxide-nitride layer on the surface when exposed to air.It is the lightest element to have six naturally occurring isotopes. Calcium has six stable isotopes calcium-40, calcium-42, calcium-43, calcium-44, calcium-46, and calcium-48.Calcium can be cut via a knife if some effort is applied.Calcium crystallises to a face centered cubic arrangement above 450☌.The density of calcium is 1484 in S.I.Calcium is a soft, ductile metal which remains silvery white in colour as long as it is not exposed to air.Hard water also contains calcium in the form of dissolved calcium carbonate it gets filtered out when it reaches a cave. Calcium is abundant in limestone, gypsum, apatite and fluorite. It is found in nature only in combined form. It is the fifth most abundant element in the earth’s crust amounting to a concentration of 4.1%. Calcium is the third most abundant metal on earth.
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