Calcium is one alkaline earth metal, that is a reactive pale yellow metal that creates a dark oxide-nitride layer when exposed to air. Its physical and also chemical properties space most comparable to its more heavier homologues strontium and also barium.

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The largest use that metallic calcium is in steelmaking, because of its solid chemical affinity because that oxygen and also sulfur.

Pure calcium metal is now made commercially by heating lime through aluminum.


Protons and also Neutrons in Calcium

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Calcium is a chemical element with atomic number 20 which means there room 20 proton in that nucleus. Total number of protons in the cell nucleus is called the atomic number of the atom and also is provided the symbol Z. The full electrical fee of the nucleus is therefore +Ze, wherein e (elementary charge) equals to 1,602 x 10-19 coulombs.

The full number of neutrons in the nucleus of one atom is called the neutron number of the atom and also is given the symbol N. Neutron number plus atomic number equals atom mass number: N+Z=A. The difference in between the ghost number and the atom number is recognized as the neutron excess: D = N – Z = A – 2Z.

For stable elements, there is typically a variety of secure isotopes. Isotopes room nuclides that have actually the exact same atomic number and are thus 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 5 stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and 46Ca) and one isotope v a half-life so lengthy that it deserve to be considered stable for all practical purposes (48Ca, v a half-life of around 4.3 × 1019 years). Calcium is the first (lightest) facet to have actually six naturally occurring isotopes.

Calcium-40 is created of 20 protons, 20 neutrons, and also 20 electrons. By far the most common isotope that calcium in nature is 40Ca, which provides up 96.941% of all natural calcium. That is created in the silicon-burning procedure from fusion of alpha particles and is the heaviest steady nuclide through equal proton and neutron numbers

Calcium-42 is written of 20 protons, 22 neutrons, and 20 electrons.

Calcium-43 is written of 20 protons, 23 neutrons, and 20 electrons.

Calcium-44 is created of 20 protons, 24 neutrons, and also 20 electrons.

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Calcium-46 is composed of 20 protons, 26 neutrons, and also 20 electrons. 46Ca and also 48Ca space the an initial “classically stable” nuclides through a six-neutron or eight-neutron overfill respectively. Although extremely neutron-rich because that such a light element, 48Ca is really stable since it is a double magic nucleus, having actually 20 protons and also 28 neutrons i ordered it in closeup of the door shells.