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A substance which is a chemical or mixture that may be harmful to the environment and to human health if inhaled, swallowed, or absorbed through the skin is called a substance
Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative abundances of 27.9769 amu (92.2297%), 28.9765 amu and 29.9738 amu (3.0872%). (only 3 decimal places) amu