Multiple Choice
In the following diagram, the element with atomic number 8 is represented by a question mark. Which element's symbol should replace the question mark?
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2. Atoms & Elements
Periodic Table: Element Symbols
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Which element is in the same period as ruthenium (Ru) but has a higher atomic number than ruthenium?
A
Palladium (Pd)
B
Silver (Ag)
C
Cadmium (Cd)
D
Rhodium (Rh)
Verified step by step guidance1
Identify the atomic number of ruthenium (Ru). Ruthenium has an atomic number of 44.
Recall that elements in the same period (row) of the periodic table have the same principal energy level but different atomic numbers.
Look for elements listed that are in the same period as ruthenium. Ruthenium is in period 5, so check which of the given elements are also in period 5.
Compare the atomic numbers of the elements in period 5 to find which has a higher atomic number than ruthenium (44).
Confirm that cadmium (Cd) is in period 5 and has an atomic number greater than 44, making it the correct answer.
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