Chemistry, 02.02.2021 14:20 shellxavier1
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a) The rows on the periodic table are called periods. How many energy levels are in the atoms of each element in period 2 (lithium-neon)
b) What is the group number of the halogens?
c) What do the elements in each group have in common?
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Answers: 1
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a) The rows on the periodic table are called pe...
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