A balanced equation has an equal number of what on each side?
- Correct Answer: protons and neutrons
- protons and reactions
- electrons and neutrons
- valencies and electrons
Explanation: If you count the number of protons and neutrons on each side of this equation, you’ll see that the numbers are the same on both sides of the arrow. This means that the equation is balanced. The thorium-234 produced in this reaction is unstable, so it will undergo radioactive decay as well. The alpha particle produced in the reaction can pick up two electrons to form the element helium. This is how most of Earth’s helium formed.
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