Multiple Choice
How do atoms become charged, and how do they balance these charges?
2. Atoms & Elements
Ions
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Which of the following statements is true concerning calcium ions?
A
Calcium ions typically carry a +2 charge.
B
Calcium ions are formed by gaining two electrons.
C
Calcium ions are formed by losing one electron.
D
Calcium ions are anions.
Verified step by step guidance1
Understand that calcium is an element in Group 2 of the periodic table, which means it is an alkaline earth metal.
Recall that elements in Group 2 typically form ions with a +2 charge because they lose two electrons to achieve a stable electron configuration.
Calcium atoms have the electron configuration [Ar] 4s². When they form ions, they lose the two 4s electrons, resulting in a Ca²⁺ ion.
Recognize that when an atom loses electrons, it forms a cation, not an anion. Anions are formed by gaining electrons.
Conclude that the correct statement is: 'Calcium ions typically carry a +2 charge.' This is because they lose two electrons, not gain them, and they are cations, not anions.
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