Multiple Choice
Which ion has the same electron configuration as an atom of He?
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2. Atoms & Elements
Ions
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Which of the following best describes how an ion differs from a neutral atom?
A
An ion has a different number of protons than a neutral atom.
B
An ion has a different number of neutrons than a neutral atom.
C
An ion is always larger in size than a neutral atom.
D
An ion has a different number of electrons than protons, resulting in a net electrical charge.
Verified step by step guidance1
Recall that a neutral atom has an equal number of protons and electrons, which balances the electrical charge to zero.
Understand that an ion forms when an atom gains or loses electrons, changing the balance between protons and electrons.
Note that the number of protons (which defines the element) remains the same in both the neutral atom and the ion.
Recognize that the number of neutrons can vary in isotopes but does not determine whether an atom is an ion or neutral.
Conclude that the defining difference of an ion compared to a neutral atom is the imbalance between electrons and protons, resulting in a net positive or negative charge.
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