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QUESTION

# An atom of polonium-218 undergoes alpha decay. What new element is produced?

is the loss of two protons and two neutrons from a nucleus. This decreases the total by 4 and the by 2.
""_ 84^218"Po"-> ""_ 82^214"X"+""_ 2^2"He"
Looking at we can find that element number 82 is lead, "Pb", so the product element "X" is "Pb".