Multiple Choice
Which of the following ions is isoelectronic with Ar?
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2. Atoms & Elements
Ions
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Which classification of atoms typically form anions?
A
Alkali metals
B
Noble gases
C
Nonmetals
D
Transition metals
Verified step by step guidance1
Understand that atoms form ions by either losing or gaining electrons to achieve a stable electron configuration, often resembling the nearest noble gas.
Recall that metals tend to lose electrons to form cations (positively charged ions), while nonmetals tend to gain electrons to form anions (negatively charged ions).
Recognize that alkali metals (Group 1) are metals that lose one electron to form cations, so they do not typically form anions.
Note that noble gases are generally inert and do not usually form ions because they already have a full valence shell.
Identify that nonmetals, which are found on the right side of the periodic table (excluding noble gases), typically gain electrons to form anions.
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