How are scientists like crime solvers?

Scientists use experiments to find out how things happen. By observing and collecting data, they can solve mysteries about how something, like a chemical reaction, occurred.

Crime solvers make observations too by gathering clues and data. They use their findings to solve how a crime occurred.

If you compare crimes with reactions, both crime solvers and scientists can figure out how something occurred without being present for the original actions that caused it.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.