The elements that is most likely to form an ionic bond are
calcium and oxygen. That is option D.
For a chemical reaction to take place, a chemical bond should either be formed or disintegrated.
An example of chemical bond is the ionic or electrovalent bonds.
The ionic bond is formed when there is sharing of electrons between two elements.
The sharing of electrons usually occur between metal and non-metal.
From the periodic table, calcium is a metal and is located at group 2 while oxygen is a non-metal and is located at group 6
Therefore when calcium and oxygen combine in a chemical reaction, ionic bond is formed.
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