The number of protons is used to identify an element in the periodic table. Hence, if the number of protons is changed, the identity of the element is changed also.
The atom of an element is composed of electrons, protons and neutrons. The number of protons in an atom is also called its atomic number.
The atomic number is used to identify an element. This implies that changing the atomic number or number of protons of an element utterly changes the identity of the element.
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