객관식
An atom has nine protons and ten electrons. This makes it:
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2. Atoms & Elements
Ions
Multiple Choice
If calcium ions, each of which has a charge of 2+, are present in a solution, what is the chemical symbol for a calcium ion?
A
Ca^{2-}
B
Ca_{2}^{+}
C
Ca^{+}
D
Ca^{2+}
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검증된 단계별 안내1
Understand that the chemical symbol for an ion consists of the element's symbol followed by its charge as a superscript.
Recall that calcium (Ca) typically forms a cation with a charge of 2+, meaning it loses two electrons.
Write the element symbol 'Ca' followed by the charge '2+' as a superscript to indicate the ion's charge correctly.
Avoid using subscripts for charge notation; subscripts indicate the number of atoms, not charge.
Therefore, the correct notation for a calcium ion with a 2+ charge is \(Ca^{2+}\).
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