The answer is D, wavelength
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Answer:
The atomic number that should be here, 57, is located at the bottom of the table in the row called the Lanthanides. Directly below the space in Row 6, in Row 7, is another empty space, which is filled by a row called the Actinides, also seen at the bottom of the chart.
Explanation:
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Answer:
18. Liters
19. grams
20. meters
21. meters
22. liters or mass (not sure on this one) it depends
23. grams