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protons: 51

electrons: 51

neutrons:70

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11y ago
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6mo ago

121Sb has 71 neutrons. This can be calculated by subtracting the atomic number of antimony (Sb), which is 51, from the mass number, which is 121.

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12y ago

70

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Q: How many neutrons does 121Sb have?
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How many neutrons does antimony contain?

Antimony (symbol Sb) has three isotopes: 121Sb, 123Sb, and 125Sb. The 121 isotope has 70 neutrons, and the 123 isotope has 72 neutrons. The 125 isotope isn't stable and will decay, but it has 74 neutrons.


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