by having the same number of protons and electrons and so still have the same chemical properties and physical properties with the exception of being somewhat denser.
All of the isotopes of an element contain the same number of protons. They differ only in the number of neutrons.
The number of electrons is an ionization state issue, and does not affect isotopic identity.
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All isotopes of an element have the same number of protons, which determines the element's identity. They also share similar chemical properties due to their identical electron configurations. The major difference among isotopes lies in their number of neutrons, affecting their Atomic Mass and stability.
Different isotopes of the same element:
Isotopes of a chemical element have a similar number of protons but a different number of neutrons.
The atomic number is the same for the all isotopes of a chemical element.
Technetium (Tc) is an element on the chart that has no stable isotopes. All of its isotopes are radioactive.
Chemical reactions involve electrons - not protons or neutrons. All isotopes of the same element have an identical number of electrons (just the number of neutrons differs) and hence the chemical properties are identical/very similar.
All neutral atoms of an element, including any of its isotopes, always do have the same number of electrons. The existence of isotopes has nothing to do with the number of electrons in an atom. Instead, the number of neutrons varies between isotopes of the same element. The number of electrons varies from that of a neutral atom only if an ion of the element is formed.