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Iodine 131, a radioactive and unstable form

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16y ago
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13y ago

Iodine ,which has the chemical symbol of I and Atomic Mass is 126.90.

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13y ago

It has 53 protons. In isotopes, the proton number does not change. Only the number of neutrons changes.

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9y ago

The atomic number of an element is determined by the number of protons one of its atoms has. In this case, 53 is the atomic number, which corresponds to Iodine.

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14y ago

Protons tell you the atomic number. Atomic number is 53.

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11y ago

53: The atomic number of an element is defined as the number of protons in the nucleus of an atom of the element.

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12y ago

The atomic number is the number of protons, so the atomic number is 54, and this is the element xenon, Xe.

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11y ago

131I or Iodine

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Q: A certain isotope contains 53 protons 78 neutrons and 54 electrons what is the atomic number?
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