Does a atom and its ion have the same chemical properties?

No, an atom and its ion do not have the same chemical properties.

This is because they have different electronic configurations and the chemical properties of a species depends mainly on its electronic configuration.

No, they do not. Chemically they react in very different ways. For example, look at potassium. In its atomic form, it is a metal that reacts with water, even in the air. As an ion, K+, it forms may salts and is an essential nutrient.

Chemical properties are determined by valence electron configurations. An atom and its ion have different valence electron configurations. Therefore, they do not have the same chemical properties.

first of all...
.. an atom is a small particle of matter with a central nucleus containing at least 1 proton
.. and an undefined number of neutrons surrounded by a region of electron density.

and
.. a neutral atom is an atom with no net charge... because the # of protons = # electrons
.. an atom with a non-zero net charge is an ion....
.. any particle with a non-zero net charge is an ion

so that
.. some atoms have zero net charge
.. some atoms are also ions
.. some ions are atoms
.. not all ions are atoms

examples
.. Na(0) is an atom of sodium with a zero net charge. it is an atom, but not an ion
.. Na(+1) is an atom of sodium with a non-zero net charge (+1).. it is an atom and it is an ion
.. SO2(0) is a molecule with a zero net charge. molecule.. not an atom.. not an ion
.. SO2(-2) is a particle with a non-zero net charge.... this is an ion as well.

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back to your question
.. ALL chemical reactions involve the rearrangement of electrons
.. neutral atoms have different numbers of electrons than ionic atoms
.. so we would expect different chemical characteristics between neutral and non-neutral atoms