Because Aluminum has 3 valence electrons, so it has to lose 3 electrons to "become" a noble gas (to be stable), so it loses 3 negative, and becomes 3 positive.
The charge on aluminium is 3+ also written as Al 3+
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Aluminum nitrite has a charge of +3, which comes from the aluminum ion (+3) and the nitrite ion (-1).
The electrical charge is +3; this is the isotope aluminium-28.
It would become an Aluminum ion that has a 3+ charge
Aluminium has the charge 3+, it is trivalent.
Whatever the charge on that ion is.
Aluminum has trivalent cation. It is Al3+
The ion with 13 protons and 10 electrons would have a 3+ charge since there are more protons than electrons. Its formula would be Al3+, representing an aluminum ion with a 3+ charge.
Aluminium is the 13th element in the period table, it has 13 electron and arranging them into their shells, 2,8,3. The outer shell is capable of holding 8 electrons but it has only 3, so it will try to stabilise itself by giving away the three electrons. The overall charge of Aluminium becomes 3- Al3-.
For an aluminium atom to gain a 3+ charge, it must lose its 3 outermost electrons; its valence electron. It then becomes an aluminium cation.
When an aluminum atom loses its three valence electrons, it becomes positively charged with a charge of +3. This results in an aluminum ion with a 3+ charge.