Multiple Choice
Which of the following is the most stable monatomic ion formed from caesium?
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2. Atoms & Elements
Ions
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Which element forms an ion with an electron configuration of [Ar] and a 2− charge?
A
Mg
B
Cl
C
S
D
O
Verified step by step guidance1
Identify the electron configuration given: [Ar]. This corresponds to the electron configuration of Argon, which has 18 electrons.
Understand that the ion has a 2− charge, meaning it has gained 2 extra electrons compared to its neutral state.
Determine the neutral atom's number of electrons by subtracting the charge from the ion's electrons: 18 (from [Ar]) minus 2 (extra electrons) equals 16 electrons in the neutral atom.
Look up the element with 16 electrons in its neutral state, which corresponds to the atomic number 16 on the periodic table.
Recognize that the element with atomic number 16 is sulfur (S), so sulfur forms an ion with a 2− charge and electron configuration [Ar].
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