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.
The Stock name for the chromium ion with a 3 plus charge is chromium(III). In this naming system, the Roman numeral indicates the oxidation state of the metal ion. Thus, chromium(III) signifies that chromium has lost three electrons to form the ion.
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.