Substance made up of two or more of the same kind of atom is

Element before carbon on the periodic table

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?