Multiple Choice
Which element is located in period 3, group 2 of the periodic table?
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4. Atoms and Elements
Periodic Table: Group Names
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Which element in Group 2 (alkaline earth metals) is the most reactive under typical conditions?
A
Magnesium (Mg)
B
Calcium (Ca)
C
Beryllium (Be)
D
Barium (Ba)
Verified step by step guidance1
Understand that Group 2 elements, known as alkaline earth metals, have reactivity that generally increases as you move down the group in the periodic table.
Recall that reactivity in metals is related to how easily they lose their outermost electrons to form positive ions; this is influenced by atomic size and ionization energy.
Note that as you move down Group 2 from Beryllium (Be) to Barium (Ba), the atomic radius increases and the ionization energy decreases, making it easier for the atom to lose electrons and thus more reactive.
Identify the elements listed: Beryllium (Be), Magnesium (Mg), Calcium (Ca), and Barium (Ba), and recognize that Barium is lower in the group than the others.
Conclude that since reactivity increases down the group, Barium (Ba) is the most reactive among the given options under typical conditions.
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