Just a quick check to see whether you're trying to cheat
Q1. The element radium has a mass number of 226...
Q2. Which phrase describes transmutation?
the conversion of an atom of one element into a different element through nuclear changes
Q3. Which statement about the balanced equations...
A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change.
Q4. Polonium has a mass number of 212...
Q5. Which statement best explains why mass is not conserved...
Some of the matter is converted to energy.
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