Dichloroethane, a compound used for dry cleaning contains 24.3% C, 4.1% H, and 71.6% Cl. The molar mass of the compound is 99 g/mole. Find the molecular formula of dichloroethane.

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answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.  

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation: