Which two elements are highly reactive with water and can exist as cations

What is the mass of 8 moles of sodium atoms

What is the standard unit of measure for acceleration?

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together