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Sagot :
The 3+ charge next to the symbol indicates a loss of 3 electrons
When atoms form ions, they lose or gain electrons. The nucleus remains intact; there is no change in the number of protons and neutrons. A loss of electrons produces a positively charged ion (a cation).
Ex= As aluminium lost 3 electrons, its ion will have a 3+ charge since the ion has 3 more positively charged protons than negatively charged electrons (ie, 13 protons, 10 electrons).
Atoms of elements which lose electrons develop a positive charge, such as the aluminium ion, Al3+ , which results when an aluminium atom loses three electrons; or the magnesium ion, Mg2+ , which results when a magnesium atom loses two electrons.
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