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Which of the following best describes an element?
Which of the following substances are elements?
How many elements are there in a molecule of sulfuric acid (H2SO4)?
Different elements have a different number of protons, neutrons, and electrons.
True or false?
Who started the development of the periodic table?
On the periodic table, the columns are called…
On the periodic table, the rows are called…
Elements in the periodic table are arranged by…