Multiple Choice
The nucleus of an atom has all of the following characteristics except that it:
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2. Atoms & Elements
The Atom
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Which pair of elements has atomic numbers that add up to 200?
A
Uranium (U, 92) and Tin (Sn, 50)
B
Gold (Au, 79) and Lead (Pb, 82)
C
Platinum (Pt, 78) and Mercury (Hg, 80)
D
Radon (Rn, 86) and Francium (Fr, 87)
Verified step by step guidance1
Identify the atomic numbers of each element in the given pairs. For example, Uranium (U) has an atomic number of 92, Tin (Sn) has 50, and so on.
Add the atomic numbers of the elements in each pair. For instance, for Uranium and Tin, calculate \$92 + 50$.
Repeat the addition for each pair: Gold (79) and Lead (82), Platinum (78) and Mercury (80), Radon (86) and Francium (87).
Compare the sums obtained for each pair to see which one equals 200.
Select the pair whose atomic numbers add up to 200 as the correct answer.
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