Multiple Choice
Which of the following is the most stable monatomic ion formed from aluminum?
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2. Atoms & Elements
Ions
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Which of the following elements would most likely form an anion during ion formation?
A
Sodium (Na)
B
Chlorine (Cl)
C
Aluminum (Al)
D
Magnesium (Mg)
Verified step by step guidance1
Understand that anions are negatively charged ions formed when an atom gains electrons.
Recall that elements on the right side of the periodic table (nonmetals) tend to gain electrons to achieve a full valence shell, thus forming anions.
Identify the position of each element: Sodium (Na), Aluminum (Al), and Magnesium (Mg) are metals on the left or middle of the periodic table, while Chlorine (Cl) is a nonmetal on the right side.
Recognize that metals typically lose electrons to form cations (positive ions), whereas nonmetals like Chlorine gain electrons to form anions.
Conclude that Chlorine (Cl) is the element most likely to form an anion because it gains electrons to complete its valence shell.
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