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The number of protons in the nucleus of an atom is its atomic number (Z). This is the defining trait of an element: Its value determines the identity of the atom. For example, any atom that contains six protons is the element carbon and has the atomic number 6, regardless of how many neutrons or electrons it may have.
In this manner, what subatomic particles determine the identity of an atom?
Protons are the subatomic particle that determines the identity of an element.
In respect to this, what is the identity of an element?
The identity of an element is its atomic number, which is the number of protons within the nucleus of one of its atoms.
Oxygen. Oxygen is a chemical element – a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus. Oxygen is a gas at room temperature and has no colour, smell or taste.