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There are 83 protons in the nucleus of bismuth-209 (Bi-209), and for the longest time, it was thought to be the heaviest element with at least one stable isotope. But it turns out that is it actually an alpha emitter with a half-life of about 19 x 10-18 years. As that is an extraordinarily long time, no wonder it wasn't discovered. But given such a long half-life, a lot of folks still consider it to be stable. But since it has been revealed that bismuth is unstable (though on a timescale longer than geologic), that leaves lead, with its 82 protons, as the heaviest element with a stable isotope.

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How do you know which element have the greatest number of protons in their nucleus?

The elements with the highest atomic numbers have the greatest numbers of protons in their nucleus, because that is the definition of atomic number.


Which element an atom is considered to be is determined by what number?

The number of protons in the nucleus of the atom.


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The number of protons in an atom's nucleus is the Atomic number.


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The number of protons in an atom's nucleus determines its chemical identity.


Number of electrons and protons in a nucleus?

The number of protons in a nucleus depends on which element it is. ( The number of protons is the decider as to which element it is. ) The number of electrons in an atom is the same as the number of protons in the nucleus, but none of the electrons are in the nucleus. Rather, they orbit around the nucleus like planets round a star.


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The number of protons in the atomic nucleus is equal to atomic number.


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The atomic number reflects the charge number of the nucleus. It is always equal to the number of protons found in the nucleus.


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There are 47 protons in Silver's atomic nucleus. The number of protons is the same as the atomic mumber.


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The number of protons in the nucleus is the same as the atomic number.


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The number of protons in the nucleus of an atom.


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