Give a modern formulation of the periodic law. Explain why the chemical properties of elements change periodically
| August 17, 2020 | Education
Give a modern formulation of the periodic law. Explain why the chemical properties of elements change periodically depending on the magnitude of the charge of the nuclei of their atoms.
The modern formulation of the periodic law of DI Mendeleev is as follows: the properties of chemical elements, as well as the forms and properties of the compound of elements, are periodically dependent on the value of the charge of atomic nuclei.
The properties of chemical elements change with an increase in the serial number (nuclear charge) periodically because the number of electrons at the external energy level and the electronic structure of atoms are periodically repeated.
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