Official website of the Commonwealth of Massachusetts. Pregister for COVID-19 vaccine Learn more about a new signup tool for mass vaccination locations. Symbol: Ca Atomic Number: 20 Atomic Mass: 40.078 amu Melting Point: 839.0 °C (1112.15 K, 1542.2 °F) Boiling Point: 1484.0 °C (1757.15 K, 2703.2 °F) Number of Protons/Electrons: 20 Number of Neutrons: 20 Classification: Alkaline Earth Crystal Structure: Cubic Density @ 293 K. The United States suffered more mass killings in 2019 than any year on record; California, with some of the strictest gun laws in the country, had the most of any state. 1) The Mass number of Calcium(Ca) is 40.078 u. 2)The Atomic Number of Calcium(Ca) is 20. 3)Themass numberalso called atomicmass numberor nucleonnum view the full answer.
The Element Calcium
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Atomic Number: 20
Atomic Weight: 40.078
Melting Point: 1115 K (842°C or 1548°F)
Boiling Point: 1757 K (1484°C or 2703°F)
Density: 1.54 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 4
Group Number: 2
Group Name: Alkaline Earth Metal
What's in a name? From the Latin word for lime, calx.
Say what? Calcium is pronounced as KAL-see-em.
History and Uses:
Although calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO). Today, metallic calcium is obtained by displacing calcium atoms in lime with atoms of aluminum in hot, low-pressure containers. About 4.2% of the earth's crust is composed of calcium.
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Due to its high reactivity with common materials, there is very little demand for metallic calcium. It is used in some chemical processes to refine thorium, uranium and zirconium. Calcium is also used to remove oxygen, sulfur and carbon from certain alloys. Calcium can be alloyed with aluminum, beryllium, copper, lead and magnesium. Calcium is also used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes.
Calcium carbonate (CaCO3) is one of the common compounds of calcium. It is heated to form quicklime (CaO) which is then added to water (H2O). This forms another material known as slaked lime (Ca(OH)2) which is an inexpensive base material used throughout the chemical industry. Chalk, marble and limestone are all forms of calcium carbonate. Calcium carbonate is used to make white paint, cleaning powder, toothpaste and stomach antacids, among other things. Other common compounds of calcium include: calcium sulfate (CaSO4), also known as gypsum, which is used to make dry wall and plaster of Paris, calcium nitrate (Ca(NO3)2), a naturally occurring fertilizer and calcium phosphate (Ca3(PO4)2), the main material found in bones and teeth.
Estimated Crustal Abundance: 4.15×104 milligrams per kilogram
![Mass Mass](/uploads/1/0/8/0/108095133/733410958.jpg)
![Number of protons in calcium Number of protons in calcium](/uploads/1/0/8/0/108095133/360312379.gif)
Estimated Oceanic Abundance: 4.12×102 milligrams per liter Windows server 2019 remote desktop.
Number of Stable Isotopes: 3 (View all isotope data)
Ionization Energy: 6.113 eV
Ca Atomic Number Mass Number
Oxidation States: +2
Electron Shell Configuration: | 1s2 |
2s2 2p6 | |
3s2 3p6 | |
4s2 |
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Date: 2/24/2021