In each of the following, identify which names are incorrect...

In each of the following, identify which names are incorrect for the given formulas, and give the correct name. a. $\mathrm{CaH}_{2}$, calcium hydride b. $\mathrm{PbCl}_{2}$, lead(IV) chloride c. $\mathrm{CrI}_{3}$, chromium(III) iodide d. $\mathrm{Na}_{2} \mathrm{~S}$, disodium sulfide e. $\mathrm{CuBr}_{2}$, cupric bromide

In each of the following, identify which names are incorrect for the given formulas, and give the correct name.
a. $\mathrm{CaH}_{2}$, calcium hydride
b. $\mathrm{PbCl}_{2}$, lead(IV) chloride
c. $\mathrm{CrI}_{3}$, chromium(III) iodide
d. $\mathrm{Na}_{2} \mathrm{~S}$, disodium sulfide
e. $\mathrm{CuBr}_{2}$, cupric bromide

Key Concepts

Hydride Naming Conventions

Hydrides are compounds in which hydrogen is bonded to a more electropositive element. In naming ionic hydrides, it is important to correctly name the compound by identifying the metal’s role and using conventional naming protocols without adding misleading prefixes or oxidation state indicators if they are unnecessary.

Binary Compound Naming Rules

Binary compounds, composed of two different elements, follow specific rules where the metal (if present) is named first and the non-metal second. The non-metal ion receives an '-ide' ending, and for metals with variable oxidation states, the correct Roman numeral must be used to denote the number of positive charges.

Oxidation States and Roman Numeral Notation

Understanding and applying oxidation states is vital to correctly name compounds, especially for transition metals that can display multiple oxidation states. The Roman numeral placed in parentheses after the metal indicates its oxidation state, ensuring that the naming accurately reflects the charges present in the compound.

Ionic Compound Nomenclature

This concept involves the systematic naming of ionic compounds by clearly identifying the positively charged ion (cation) and the negatively charged ion (anion). The cation is usually named using the element’s standard name, sometimes appended with its oxidation state in Roman numerals when necessary, while the anion should have its name modified, typically ending with '-ide' in binary compounds.

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