Marie1969
Marie1969
29-09-2017
Chemistry
contestada
3. What does Letter X and Y represent?
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Hady2000
Hady2000
29-09-2017
y means families and are vertical (alkaline, alkaline earthmetals, halogens, transition metals, noble gases, etc)
x means periods andare horizontal (1,2,3,4,5)
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