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The element that has 17 protons is Chlorine, or Cl. The particular isotope of Cl that has 21 neutrons is called 38Cl, and is radioactive, having a half-life of 37.24 minutes. In this particular case, the number of electrons of this isotope are greater than its number of protons by one. That means that this isotope is also an ion, and is labeled as 38Cl-.

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13y ago
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3mo ago

The isotope with 17 protons, 18 electrons, and 21 neutrons is chlorine-38 (Cl-38).

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Q: What are you isotope or ion 17 protons 18 electrons 21 neutrons?
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