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Example Question #72 : Introductory Topics
Possible Answers:
Correct answer:
Explanation:
This is a question regarding radioactive decay, specifically alpha decay. An alpha particle has the same identity as the nucleus of a atom, or
. To solve this problem, we must perform simple addition and subtraction.
, and
. So, the two new numbers become
and
, eliminating one of the answer choices. Next, we must remember that the bottom number, in this case
, signifies atomic number. Atomic number defines the identity of the element. So, we must find the element with the atomic number
, which is
.
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