Write the anions and cations of the given elements.

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Solution

· The alkali metals (the IA elements) lose a single electron to form a cation with a 1+ charge.

· The alkaline earth metals (IIA elements) lose two electrons to form a 2+ cation.

· Aluminum, a member of the IIIA family, loses three electrons to form a 3+ cation.

· The halogens (VIIA elements) all have seven valence electrons. All the halogens gain a single electron to fill their valence energy level. And all of them form an anion with a single negative charge.

· The VIA elements gain two electrons to form anions with a 2- charge.

· The VA elements gain three electrons to form anions with a 3- charge.

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Question 14
Write the cations and anions present (if any) in the following compounds

(a) $C H_{3} C O O N a$
(b) $N a C l$
(c) $H_{2}$
(d) $N H_{4} N O_{3}$

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