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Scientists call a row on the periodic table a ______.
physicist
correct
periodicity
column
spectroscopy
energy
located
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Moseley recognized that he was able to use a new technique called X-ray ________ to determine the atomic number for each element.
physicist
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spectroscopy
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English ________ Henry Moseley made an important discovery in 1914.
physicist
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The discoveries of gallium (31) and germanium (32) proved that Mendeleev was _________.
physicist
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periodicity
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spectroscopy
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A family, or group, is a set of elements in the same _______ on the periodic table.
physicist
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The row that a certain element is ______ in also designates the energy level of its valence electrons.
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periodicity
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spectroscopy
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Each period represents an _______ level.
physicist
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periodicity
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spectroscopy
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Scientists started to notice repeating patterns when they arranged the elements in order by increasing atomic mass. This repeated pattern is called _______.
physicist
correct
periodicity
column
spectroscopy
energy
located
period
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