Multiple Choice
Which of the following elements typically forms a 2+ ion based on its position in the periodic table?
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2. Atoms & Elements
Periodic Table: Charges
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Which of the following combinations of elements has atomic numbers that add up to 200?
A
Ca (20), Fe (26), Cu (29), and Pb (82)
B
Au (79), Hg (80), and Zn (41)
C
Sn (50), Ag (47), Xe (54), and Bi (83)
D
Kr (36), Rb (37), Cs (55), and I (53)
Verified step by step guidance1
Identify the atomic numbers of each element in the given combinations. For example, Ca = 20, Fe = 26, Cu = 29, Pb = 82, and so on.
Add the atomic numbers of the elements in each combination separately. For instance, for the first group, calculate 20 + 26 + 29 + 82.
Repeat the addition for the second and third groups of elements, summing their atomic numbers accordingly.
Compare the sums obtained from each group to see which one equals 200.
Verify that the combination Kr (36), Rb (37), Cs (55), and I (53) indeed sums to 200 by adding their atomic numbers: 36 + 37 + 55 + 53.
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