How does the electron-cloud model describe electrons?

Which sample at stp has the same number of atoms as 18 liters of ne at stp

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

Select the statement that describe chemical properties a. antacid tablets neutralize stomach acid b. helium is the lightest monatomic element c. water freezes at 0 celsius d. mercury is liquid at room temperature