A, C, and B. These are seen in a square of the periodic table.
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Explanation:
Periodic table shows the symbol of each element and along with that it shows atomic mass of each element.
Also, it is known that each element present in a periodic table is neutral and in a neutral atom number of protons equal number of electrons.
Hence, it means that periodic table also tells the number electrons present in an atom.
Therefore, we can conclude that following information is included in each square of the periodic table of elements.
