Multiple Choice
What is the most stable monatomic ion formed from lithium?
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2. Atoms & Elements
Ions
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Which of the following ions is not isoelectronic with the others?
A
K^+
B
Al^{3+}
C
Na^+
D
Mg^{2+}
Verified step by step guidance1
Understand the concept of isoelectronic species: ions or atoms that have the same number of electrons.
Determine the number of electrons in each ion by subtracting the charge from the atomic number (number of protons) of the neutral atom.
Calculate the electrons for each ion: For example, for K^+, start with potassium's atomic number (19) and subtract 1 electron due to the +1 charge, resulting in 18 electrons.
Repeat the calculation for Al^{3+}, Na^+, and Mg^{2+} to find their electron counts.
Compare the electron counts of all ions; the ion with a different number of electrons is not isoelectronic with the others.
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