2. what happens when an electron returns to
its ground state from its excited state?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Draw metallic bonding if two copper

What does the mass of 0.7891 mol of ferric oxide (fe2o3)