Jon P. answered 02/16/15
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In beta decay, a neutron changes to a proton and electron pair, and the electron is emitted as the "beta particle."
So by gaining a proton, the atomic number goes up, but the mass stays the same.
Po is atomic number 84. Atomic number 85 is Astatine. So the answer is:
The product is Astatine-210 plus the emission of an electron.