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Fluorine.
it is about the atomic number. Calcium is the element.
The element calcium, or Ca, is located in group 2, period 4 of the periodic table. Therefore, its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2. This can also be written as [Ar] 4s2, because the beginning of that electron configuration is the same as argon's. The 42 you mentioned in your question is referring to a specific isotope of calcium and has nothing to with the electron configuration.
An electromagnetic force attraction between opposite charges pulls atoms together, either between electrons and nuclei, or as the result of a dipole attraction.
Chlorine reacts readily with calcium. Calcium donates two electrons to this ionic bond and chlorine accepts one electron from calcium into its valance shell, so you need two chlorines to react with calcium. Ca(2+) and Cl- = CaCl2 Calcium chloride
You don't. Calcium is not an electron, calcium is a element
This chemical element is calcium (Ca).
itself
Fluorine.
Potassium has one.
The element Calcium (Ca) has 20 electrons according to its atomic number which is 20.
it is about the atomic number. Calcium is the element.
N
Calcium, or Ca
Considering the normal calcium ion Ca2+ it has the same electronic configuration as the noble gas Argon.
Sodium. Sodium is more reactive than calcium, because sodium has one valence electron whereas calcium has two valence electron. It is easier to lose one electron and react with oxygen and form sodium oxide, compared to losing two electrons and from calcium oxide.
Iron has the electron configuration [Ar]3d64s2.