An atom's identity is determined by the number of protons in its nucleus, which is also known as its atomic number. The atomic number is a fundamental property of an element and is unique to each element on the periodic table. Each element has a specific number of protons in its nucleus, and this determines its chemical properties and characteristics. To determine an atom's identity, you can look up the element on the periodic table and find its atomic number.
The number of protons in an atom's nucleus determines its identity. Each element on the periodic table is uniquely identified by its atomic number, which represents the number of protons in an atom of that element.
