kathia18 kathia18
  • 12-09-2017
  • Chemistry
contestada

can the groups of the periodic table be numbered in two different ways

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Аноним Аноним
  • 12-09-2017
The groups (left to right) are numbered from 1 to 18. they arent numbered any other way. 

period (up to down.) are numbered from 1-7
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