Calcium is an alkaline planet metal, it is a reactive pale yellow steel that forms a dark oxide-nitride layer when exposed come air. The physical and also chemical properties space most similar to its more heavier homologues strontium and barium.
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The biggest use of metallic calcium is in steelmaking, because of its strong chemical affinity because that oxygen and also sulfur.
Pure calcium metal is currently made commercially by heater lime v aluminum.
Protons and also Neutrons in Calcium
The complete number of neutrons in the nucleus of one atom is dubbed the neutron number of the atom and also is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. The difference in between the spirit number and also the atom number is recognized as the neutron excess: D = N – Z = A – 2Z.
For secure elements, there is generally a variety of steady isotopes. Isotopes are nuclides that have actually the same atomic number and are as such the very same element, yet differ in the variety of neutrons. Mass number of common isotopes the Calcium are 40; 42; 43; 44; 46.
Main isotopes of Chlorine
Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and also 46Ca) and also one isotope with a half-life so lengthy that it deserve to be considered stable for all valuable purposes (48Ca, v a half-life of about 4.3 × 1019 years). Calcium is the first (lightest) aspect to have six naturally arising isotopes.
Calcium-40 is composed of 20 protons, 20 neutrons, and also 20 electrons. By far the most usual isotope of calcium in nature is 40Ca, which renders up 96.941% that all natural calcium. That is created in the silicon-burning process from blend of alpha particles and is the heaviest secure nuclide with equal proton and neutron numbers
Calcium-42 is composed of 20 protons, 22 neutrons, and also 20 electrons.
Calcium-43 is composed of 20 protons, 23 neutrons, and 20 electrons.
Calcium-44 is written of 20 protons, 24 neutrons, and 20 electrons.
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Calcium-46 is written of 20 protons, 26 neutrons, and also 20 electrons. 46Ca and 48Ca space the an initial “classically stable” nuclides with a six-neutron or eight-neutron overabundance respectively. Although exceptionally neutron-rich for such a light element, 48Ca is an extremely stable because it is a doubly magic nucleus, having actually 20 protons and 28 neutrons arranged in closeup of the door shells.