Multiple Choice
Which of the following describes how a neutral atom forms a positive ion (cation)?
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2. Atoms & Elements
Ions
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Which of the following ions is isoelectronic with Ne?
A
O^{2-}
B
F^+
C
Cl^-
D
Na^+
Verified step by step guidance1
Recall that 'isoelectronic' means having the same number of electrons. Neon (Ne) has an atomic number of 10, so it has 10 electrons in its neutral state.
Determine the number of electrons for each ion by adjusting for their charge: for an anion (negative charge), add electrons; for a cation (positive charge), subtract electrons.
Calculate electrons for O^{2-}: Oxygen has 8 protons, so neutral O has 8 electrons. Adding 2 electrons for the 2- charge gives 8 + 2 = 10 electrons.
Calculate electrons for F^{+}: Fluorine has 9 protons, so neutral F has 9 electrons. Removing 1 electron for the +1 charge gives 9 - 1 = 8 electrons.
Calculate electrons for Cl^{-} and Na^{+} similarly, then compare all to 10 electrons to identify which ions are isoelectronic with Neon.
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