The periods are the _____ of the periodic table.
A) transition metals
B) halogens
C) rows
D) columns
E) numbers
Correct Answer:
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Q18: Which of the following is NOT true
Q19: What is the identity of the missing
Q20: What fraction of the electromagnetic spectrum is
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A)
Q24: Which pair correctly matches an element to
Q25: Most of the micronutrients are
A) transition metals.
B)
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Q27: The symbol Q28: According to the graph, what is the
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