What factors determine if an atom forms a covalent or ionic bond with another atom?

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The number of electrons in an atom, particularly the number of the electrons furthest away from the nucleus determines the atom’s reactivity and hence its tendency to form covalent or ionic bonds. These outermost electrons are the one’s that are more likely to “feel” the presence of other atoms and hence the one’s involved in bonding i.e. In reactions.

Chemistry of an element depends almost entirely on the number of electrons, and hence its atomic number.

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