Which of the following describe chemical properties?
- water boils at 0c
- helium is the lightest monatomic element
- sugar burns in air to form water and carbon dioxide
- iodine (a purple solid) becomes a purple gas

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.

C3h8o3 - glycerol major species present when dissolved in water

Me i dont know what to do! 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.