By the number of the period in which the chemical element is located, you can determine …
| May 31, 2021 | education
A period is a horizontal row of chemical elements that begins with an alkali metal and ends with an inert gas.
The periodic table of chemical elements has seven periods.
The first period contains two elements, the second and the third – 8 elements, the rest have 18 or more elements. The seventh period is not completed.
The first, second and third periods are called small periods, and the rest are called large periods.
The period number shows the number of energy levels.
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