What is released when an excited electron returns to a lower energy state?

Given the different molecular weights, dipole moments, and molecular shapes, why are their molar volumes nearly the same?

According to Charles's law, under which conditions will the volume of a given amount of gas be proportional to temperature

What are halogens, solid, liquid, or gas?

If 0.899J of heat causes a 0,692 degree C temperature change, what mass of water is present?

What is the heaviest alkaline earth metal?

What is an isotope? Give an example of an element with isotopes.

Consider the reaction between liquid water and aqueous magnesium nitride to form solid magnesium oxide and ammonia gas. If magnesium nitride is present in excess, how many moles of water are needed to form 9.17*1023 ammonia molecules?

The properties of elements are arranged by ... A. mass numbers B. atomic masses C. atomic radii D. atomic numbers

When a tire is inflated with air is it a chemical or physical change?

Which isotope is used to date ancient artifacts such as fossils? carbon-12 carbon-14 uranium-238 oxygen-16