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3. What does Letter X and Y represent?
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3. What does Letter X and Y represent?

3. What does Letter X and Y represent?-example-1
User Mandoleen
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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)
User Igor Peshansky
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