Interpretation: The correct option needs to be chosen from the given choices when the magnesium element forms an ion.
Concept Introduction: An atom can lose or gain electron/s to attain noble gas electron configuration. A cation or positive charge ion is formed when an atom loses electron/s similarly, an anion or negative charge ion is formed when an atom gain electron/s.
Answer to Problem 4STP
The correct choice is option (B) that loses two electrons.
Explanation of Solution
Reason for correct choice/s:
The given element is magnesium. It belongs to group 2 and its
Here, the valence shell is 3s thus, the electrons present in it are called valence electrons. The number of valence electrons of magnesium is 2.
Since magnesium is a metal it loses electrons to form a cation. Therefore, the correct choice is “loses two electrons”.
Therefore, the correct option is (B).
Reason for incorrect choice/s:
The given element is magnesium which is a metal. Since metals tend to be electron-rich, they do not gain electron/s to attain noble gas electron configuration. Therefore, (A), (C), and (E) cannot be correct choices.
Also, magnesium belongs to group 2 and has 2 valence electrons. If it loses one electron, the octet cannot be completed and it does not attain noble gas configuration. Therefore, (D) is an incorrect choice.
Chapter 7 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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