Changes

Radium-226 decays into Radon-222 by emission of an alpha particle with an energy of 4.78 MeV.

Radium-226 decays into Radon-222 by emission of an alpha particle with an energy of 4.78 MeV.

1 kg of Radium-226 = <math>\frac{.622 \times 10^{27}}{226.0254}</math> atoms.  (The numerator is Avogadro's number, and the denominator is the atomic weight of Radium-226.)  This is 2.6643647 * 10²⁴ atoms.

1 kg of Radium-226 = <math>\frac{6.022 \times 10^{23}}{226.0254}</math> atoms.  (The numerator is [[Avogadro's number]], and the denominator is the atomic weight of Radium-226.)  This is 2.6643647 * 10²⁴ atoms.

That number of Radon-222 atoms has mass .98226836 kg.  That number of alpha particles has mass .01770863 kg.

That number of Radon-222 atoms has mass .98226836 kg.  That number of alpha particles has mass .01770863 kg.

Also, Radon-222 decays into Polonium-218 by emission of an alpha particle with an energy of 5.49 MeV.

Also, Radon-222 decays into Polonium-218 by emission of an alpha particle with an energy of 5.49 MeV.

1 kg of Radon-222 = <math>\frac{.622 \times 10^{27}}{222.0176}</math> atoms.  This is 2.7124611 * 10²⁴ atoms.

1 kg of Radon-222 = <math>\frac{6.022 \times 10^{23}}{222.0176}</math> atoms.  This is 2.7124611 * 10²⁴ atoms.

That number of Polonium-218 atoms has mass .98194467 kg.  That number of alpha particles has mass .01802830 kg.

That number of Polonium-218 atoms has mass .98194467 kg.  That number of alpha particles has mass .01802830 kg.

This is a common way that scientific discoveries are made.  But, as stated above, this is not how E=mc&sup2; was discovered.  But it could have been. But in the event, it wasn't.

This is a common way that scientific discoveries are made.  But, as stated above, this is not how E=mc&sup2; was discovered.  But it could have been. But in fact, it wasn't.

==See also==

==See also==