The distribution of electrons in the atom of a chemical element corresponds to a number of numbers 2,8,3. in the periodic system of D.I. Mendeleev, this element is located …?
The sum of electrons corresponds to the ordinal number of the element in the periodic table. Add electrons:
2 + 8 + 3 = 13
This is the serial number of the element, it is located in each square of the element at the top right. This number corresponds to AL – 13 characters of the periodic table. We go up from the sign and see that it is in the third group (lll). The Arabic numeral 3 is written to the left of the sign, which means that the chemical element AL is in the third period.
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