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CA on an electronic calculator usually stands for "Clear All" or "Clear All Entries." Pressing the CA button will clear all calculations or data stored in the calculator's memory. It essentially resets the calculator to its starting state.
No, Ca (calcium) is a single cation with a charge of +2. It has lost two electrons to achieve a stable electronic configuration.
The electronic configuration of Calcium (Ca) is 1s2 2s2 2p6 3s2 3p6 4s2.
Li, Be, O: the first term in the abridged electron configuration is [He]. Ca, K: the first term in the abridged electron configuration is [Ar].
The element that forms a 2+ ion with the same electronic configuration as Ar is Calcium (Ca). When Calcium loses two electrons, it attains the same electronic configuration as argon by having a full outer shell of electrons.
Cl- and Ca2+ has the electronic configuration of the noble gas, Ar, with 18 electrons.