객관식
Which of the following elements typically forms a 2+ ion based on its position in the periodic table?
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객관식
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)
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검증된 단계별 안내1
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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