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Anni [7]
3 years ago
14

How are the periods, or horizontal rows, on a periodic table ordered from left to right? (2 points)

Chemistry
2 answers:
Nesterboy [21]3 years ago
8 0
The answer is the second one .......................
Anarel [89]3 years ago
6 0
#2
They are ordered by increasing number of protons (aka atomic number)
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