Whatever the charge on that ion is.
+3 for Al and -2 for O is the oxidation number for Al2O3.
The oxidation number of chlorine in AlCl4 is -1. Since aluminum has an oxidation number of +3, the overall charge of the AlCl4 ion is -1, meaning each chlorine atom has an oxidation number of -1 to balance the charge.
The oxidation number of Al is +3 in the complex ion Al(OH)4-. Each hydroxide ion (OH-) carries a charge of -1, so the total charge of the complex ion is -1. Since there are four hydroxide ions, the aluminum ion must have an oxidation number of +3 to balance the charges.
The oxidation number of sulfur in aluminum sulfate is +6. This is because each oxygen atom has an oxidation number of -2, and there are four oxygen atoms in the sulfate ion (SO4). The overall charge of the sulfate ion is -2, so the oxidation number of sulfur must be +6 to balance the charge.
The oxidation number of aluminum in aluminum chloride (AlCl3) is +3. Aluminum typically has an oxidation number of +3 when it forms ionic compounds.
+3 for Al and -2 for O is the oxidation number for Al2O3.
The oxidation number of chlorine in AlCl4 is -1. Since aluminum has an oxidation number of +3, the overall charge of the AlCl4 ion is -1, meaning each chlorine atom has an oxidation number of -1 to balance the charge.
The formula of the compound formed between aluminum ions and phosphate ions is AlPO₄, which is known as aluminum phosphate. It is composed of one aluminum ion (Al³⁺) and one phosphate ion (PO₄³⁻) to balance the charges and form a neutral compound.
The oxidation number of Al is +3 in the complex ion Al(OH)4-. Each hydroxide ion (OH-) carries a charge of -1, so the total charge of the complex ion is -1. Since there are four hydroxide ions, the aluminum ion must have an oxidation number of +3 to balance the charges.
The oxidation number of aluminum in aluminum chloride (AlCl3) is +3. Aluminum typically has an oxidation number of +3 when it forms ionic compounds.
In MgBr2, the magnesium ion (Mg) has an oxidation number of +2, while the bromide ion (Br) has an oxidation number of -1.
The oxidation number of sulfur in aluminum sulfate is +6. This is because each oxygen atom has an oxidation number of -2, and there are four oxygen atoms in the sulfate ion (SO4). The overall charge of the sulfate ion is -2, so the oxidation number of sulfur must be +6 to balance the charge.
The oxidation number of carbonate ion (CO3) is -2. Each oxygen atom has an oxidation number of -2, and the sum of the oxidation numbers in the ion must equal the charge of the ion, which is -2.
The oxidation number of the nitrite ion (NO2-) is -1. The oxidation number of nitrogen in the nitrite ion is +3, and each oxygen atom has an oxidation number of -2.
The oxidation number of a monatomic ion equals its charge. For example, the oxidation number of a sodium ion (Na+) is +1, which matches its charge of +1.
The oxidation number of nitrogen in the ammonium ion NH4+ is -3, and the oxidation number of hydrogen is +1. In ammonium chloride NH4Cl, the net charge on NH4 is +1 because the chloride ion Cl- has an oxidation number of -1.
The oxidation number of Al is +3.