Multiple Choice
Which of the following beryllium halides is considered an ionic compound?
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3. Chemical Reactions
Naming Ionic Compounds
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Which one of the following correctly pairs the element with the charge it typically forms in an ionic compound?
A
Sodium (Na), +1
B
Magnesium (Mg), +1
C
Chlorine (Cl), +2
D
Aluminum (Al), +2
Verified step by step guidance1
Understand that ionic compounds form when atoms transfer electrons to achieve a full outer shell, resulting in ions with positive or negative charges called cations and anions, respectively.
Recall the typical charges of common elements based on their group in the periodic table: Group 1 elements (alkali metals) usually form +1 ions, Group 2 elements (alkaline earth metals) form +2 ions, Group 17 elements (halogens) form -1 ions, and Group 13 elements often form +3 ions.
Identify Sodium (Na) as a Group 1 element, which typically loses one electron to form a +1 cation.
Recognize Magnesium (Mg) as a Group 2 element, which typically loses two electrons to form a +2 cation, not +1.
Note that Chlorine (Cl), a halogen, typically gains one electron to form a -1 anion, not +2, and Aluminum (Al), a Group 13 element, typically forms a +3 cation, not +2.
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