An isotope of phosphorus has a half-life of 14 days. if you started with a 500 gram sample, how
much would remain after 28 days?

What is the equilibrium constant of aa+bb=cc+dd

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

How have the greenhouse gasses increased from the year 2000 to 2018