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photoshop1234 [79]
3 years ago
10

For the following nuclear reaction, what was the beginning radionuclide (X)? X → 86Rn222 + 2He4

Chemistry
1 answer:
BigorU [14]3 years ago
3 0
The original radioisotope underwent double-alpha decay, where the original nucleus lost a total of 4 protons and 4 neutrons.

The original radioisotope would have an atomic number of 86+4 (protons), and would have an atomic mass of 222+8 (protons + neutrons). This would make the element Thorium-230, or 90Th230.
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The kg is a quantity of mass used to measure the amount of matter in a substance.

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The kilo-  is a prefix that denotes 10³

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Now that we know this, we can convert:

   5.25 x 10⁻¹³kg  x \frac{1000g}{1kg}  x \frac{1000mg}{1g}   =  5. 25 x 10⁻¹³ x 10⁶mg

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learn more:

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