Respuesta :

esraax
it means that the atom or the group of atoms became positive ion by losing two electrons Ex.
[tex] {be}^{ + 2} \: or \: {mg}^{ + 2} [/tex]

++ can have different meanings in Math, Accounting and other subjects. As the question is about chemistry, ++ means a neutral atom or molecules has lost 2 electrons.  It now has a double positive charge. An example is Calcium ion, Ca++.


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