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Isotopes are different forms of the same element which have different numbers of neutrons in their atomic nuclei. A given element is identified by the number of protons in its nucleus; that's its atomic number. Two different isotopes of the same element have the same number of protons, but each has a different number of neutrons in its nucleus. Different isotopes of the same element are chemically the same.
There is no specific number; each element has another number of natural and artificial isotopes.
Isotopes are atoms that have the same number of protons and electrons. They have the same atomic number on the periodic table but they have a different number of neutrons and so they have different mass. Isotopes of the same element can have different chemical properties.
The numbers of protons and electrons are identical.
Oxygen typically has 8 protons, 8 electrons, and 8 neutrons; the number of neutrons can vary slightly in different isotopes of oxygen.