According to the periodic table, which of these elements has the most electron energy levels? A. fluorine (F) B. sodium (Na) C. calcium (Ca) D. rubidium (Rb)

What happens when light is scattered?

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.