객관식
Which of the following elements is a metalloid that would most likely form a positive ion?
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2. Atoms & Elements
Periodic Table: Charges
객관식
Which element on the periodic table has 55 protons?
A
Rubidium (Rb)
B
Strontium (Sr)
C
Barium (Ba)
D
Cesium (Cs)
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검증된 단계별 안내1
Recall that the number of protons in an atom is equal to its atomic number, which uniquely identifies each element on the periodic table.
Look up the atomic numbers of the given elements: Rubidium (Rb), Strontium (Sr), Barium (Ba), and Cesium (Cs).
Compare the atomic numbers to find which element has exactly 55 protons.
Identify that the element with atomic number 55 is Cesium (Cs).
Conclude that Cesium (Cs) is the element with 55 protons based on its atomic number.
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