a strip of magnesium metal is ignited using a lighter wand. The result is an intensely glowing white light. As the burning of the metal subsides, a white powder-like substance now appears replacing the smooth ribbon of metal. How do you explain what happened? Be sure to use the following terms: physical properties, chemical properties, pure substance, reactivity, chemical change and emission of light.

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough