Well, TECHNICALLY, the periodic table is "based" upon a whole myriad of characteristics. But if you're talking about the consecutive arrangement of elements...it would be B, the atomic number.
Answer:
68
Explanation:
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Elements because elements make up atoms which make up everything
aswer: protactinium-234 is more dang erous than uranium
Answer:
I THINK expose all six plants to green light
Explanation:
