Multiple Choice
Where are the noble metals typically located on the periodic table?
2. Atoms & Elements
Periodic Table: Group Names
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Which of the following elements is the most reactive among the alkali metals?
A
Sodium (Na)
B
Potassium (K)
C
Cesium (Cs)
D
Lithium (Li)
Verified step by step guidance1
Recall that alkali metals are elements in Group 1 of the periodic table, including Lithium (Li), Sodium (Na), Potassium (K), and Cesium (Cs).
Understand that reactivity in alkali metals increases as you move down the group because the outermost electron is farther from the nucleus and more easily lost.
Compare the elements given: Lithium (Li) is at the top, followed by Sodium (Na), then Potassium (K), and Cesium (Cs) is further down the group.
Recognize that Cesium (Cs), being lower in the group, has the largest atomic radius and the weakest attraction for its outer electron, making it the most reactive among the listed alkali metals.
Therefore, the order of reactivity from least to most reactive among these elements is Lithium < Sodium < Potassium < Cesium.
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