Discussion
How are the following elements arranged in the Periodic table?
Answer: B
The first five elements of the periodic table, in order of atomic number, are H, He, Li, Be and B - hydrogen (1), helium (2), lithium (3), beryllium (4) and boron (5).
The table is arranged by atomic number, which is the number of protons in the nucleus, not by atomic mass or by any chemical property.
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