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questionedithistorytranslations
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flag English language

how many groups and periods does the modern periodic table have
6 periods and 14 groups
7 periods and 18 groups
8 periods and 19 groups
9 periods and 20 groups
The modern periodic table of the elements contains 18 groups, or vertical columns. Elements in a group have similar chemical and physical properties because they have the same number of outer electrons. The periodic table consists of seven periods. The periods vary in length.
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genesismission.jpl.nasa.gov
2
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flag Polish language

Ile okresów i grup zawiera Tablica Mendelejewa?
6 okresów i 14 grup
7 okresów i 18 grup
8 okresów i 19 grup
9 okresów i 20 grup
Współczesny wygląd układu okresowego zawdzięczamy Nielsowi Bohrowi, który podzielił go na grupy i okresy. Grupy zazwyczaj wypisuje się w kolumnach, a okresy w rzędach. Grupy dzieli się na grupy główne i grupy poboczne.
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wikipedia → Układ okresowy pierwiastków
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