Multiple Choice
Which of the following is the correct chemical formula for chromium(II) nitrite?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following metals is NOT required to have its charge specified in the names of ionic compounds it forms?
A
Iron
B
Copper
C
Sodium
D
Lead
Verified step by step guidance1
Understand that some metals can form more than one type of positive ion (cation) with different charges. These metals are called transition metals or metals with variable oxidation states.
Recall that when naming ionic compounds containing metals with variable charges, the charge must be specified using Roman numerals in parentheses. For example, Iron can form Fe²⁺ and Fe³⁺, so we specify the charge as Iron(II) or Iron(III).
Identify which metals in the list are transition metals or have multiple common oxidation states: Iron, Copper, and Lead all have variable charges and require specifying the charge in the compound name.
Recognize that Sodium is an alkali metal and forms only one common ion, Na⁺, with a fixed charge of +1. Therefore, its charge does not need to be specified in the name of its ionic compounds.
Conclude that Sodium is the metal that does NOT require its charge to be specified in the names of ionic compounds it forms.
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