Explain why an excited electron that changes more energy levels results in blue and violet fireworks, and why an excited electron that only changes few energy levels result in red and yellow fireworks

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull