Multiple Choice
In the periodic table, what is the term used to refer to the columns?
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2. Atoms & Elements
Periodic Table: Group Names
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Which element is considered the most reactive metal among the alkali metals in the periodic table?
A
Cesium (Cs)
B
Potassium (K)
C
Lithium (Li)
D
Sodium (Na)
Verified step by step guidance1
Understand that alkali metals are elements in Group 1 of the periodic table, which include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).
Recall 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, making the element more reactive.
Recognize that Cesium (Cs) is located below Potassium (K) and Sodium (Na) in the periodic table, meaning it has a larger atomic radius and lower ionization energy compared to those elements.
Use the trend that lower ionization energy corresponds to higher reactivity in metals, especially in alkali metals, because they lose their outer electron more readily.
Conclude that among the given options, Cesium (Cs) is the most reactive metal due to its position in the periodic table and the associated trends in atomic structure and ionization energy.
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