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Chemistry Zumdahl, 7 ed. Houghton Mifflin Company Boston New York
Preparation for chemical experiments
In order to successfully carry out experiments, one must understand the interrelation between the chemical and physical properties of similar elements. Russian scientist-chemist Dmitry Mendeleev more than 100 years ago discovered the principle of placing chemical elements on the basis of relative atomic mass.
Later researchers were able to propose a model of the chemical atom and experimentally proved the dependence of the properties on the order number of the element which is equal to the charge of the atomic nucleus.