객관식
Which of the following is the correct symbol for the ion with 19 protons and 18 electrons?
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2. Atoms & Elements
Ions
Multiple Choice
When forming ions, does calcium (Ca) lose or gain electrons?
A
Calcium neither loses nor gains electrons.
B
Calcium shares electrons to form a neutral ion.
C
Calcium gains electrons to form an anion.
D
Calcium loses electrons to form a cation.
검증된 단계별 안내1
Recall that calcium (Ca) is an element in Group 2 of the periodic table, also known as the alkaline earth metals.
Elements in Group 2 typically have two electrons in their outermost shell (valence electrons).
When forming ions, these elements tend to lose their valence electrons to achieve a stable electron configuration similar to the nearest noble gas.
Losing two electrons results in a positively charged ion (cation) with a charge of +2, written as Ca^{2+}.
Therefore, calcium loses electrons to form a cation rather than gaining electrons or sharing them.
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