| Atomic number 20 | Mass volume 1.6 g.cm – 3 at 20°C | Melting point 840 °C | Boiling point 1484 °C | Vanderwaals radius 0.197 nm |
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What is calcium’s matching element?
On heating, calcium reacts with hydrogen, halogens, boron, sulfur, carbon, and phosphorus . Although it compares favourably with sodium as a reducing agent, calcium is more expensive and less reactive than the latter.
What is calcium’s normal phase?
| Name Calcium | Density 1.55 grams per cubic centimeter | Normal Phase Solid | Family Alkaline Earth Metals | Period 4 |
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What is calcium’s odor?
Calcium sulfide, CaS, crystallizes in cubes like rock salt and occurs as oldhamite in nature. CaS has an odor of rotten eggs , which stems from H 2 S formed by hydrolysis of the calcium sulfide.
What is calcium’s density at STP?
| Calcium | Phase at STP solid | Melting point 1115 K (842 °C, 1548 °F) | Boiling point 1757 K (1484 °C, 2703 °F) | Density (near r.t. ) 1.55 g/cm 3 |
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What are 3 uses for calcium?
Calcium compounds, rocks, and minerals such as limestone and marble are also used in construction. Gypsum is used to make plaster of Paris and drywall. Other applications include antacids, toothpaste, and fertilizer . Calcium is also a very important element in both plant and animal life.
What color is pure calcium?
Calcium is a silvery-white , soft metal that tarnishes rapidly in air and reacts with water. Calcium metal is used as a reducing agent in preparing other metals such as thorium and uranium. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys.
Is oxygen a metal or nonmetal?
Oxygen, carbon, sulfur and chlorine are examples of non-metal elements . Non-metals have properties in common. They are: poor conductors of heat and electricity (they are insulators )
What is the chemical name of SR?
strontium (Sr), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is used as an ingredient in red signal flares and phosphors and is the principal health hazard in radioactive fallout.
What is the formula of magnesium?
Magnesium ion | Mg+2 – PubChem.
What does pure calcium look like?
In its pure elemental state, calcium is a soft, silvery-white alkaline earth metal .
What are Calciums properties?
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 850°C (1,560°F) and its boiling point is 1,440°C (2,620°F).
Why is calcium a soft metal?
Calcium isn’t found free in nature, but it can be purified into a soft silvery-white alkaline earth metal. Because the alkaline earth metals are reactive , pure calcium typically appears dull white or gray from the oxidation layer that quickly forms on the metal when it’s exposed to air or water.
What element has the smallest volume at STP?
Answer and Explanation: The elements with the smallest volume at STP would be A) Zinc . At STP all of these elements are solids and zinc has the greatest density (7.133grams/cm3 7.133 g r a m s / c m 3 ), which means that a 10g sample of zinc would occupy the smallest amount of space.
Which element has the highest density at STP?
The first chemical element with the lowest density is Hydrogen and the highest density is Osmium .
How does calcium help my body?
Your body needs calcium to build and maintain strong bones . Your heart, muscles and nerves also need calcium to function properly. Some studies suggest that calcium, along with vitamin D, may have benefits beyond bone health: perhaps protecting against cancer, diabetes and high blood pressure.
