How much does 1ml of water weigh in grams?

Name the element in group 17, period 2. (periodic table)

The excretory system,need answers for all: )

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