Explain how an aluminum atom that forms a cation with a +3 electric charge and a sulfur atom that forms an anion with a -2 electric charge can combine to form a stable electrically neutral ionic compound. .What would be the correct formula for such a compound?

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.