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Chapter 6: Problem 17

Write the chemical formula for (a) yttrium sulfide (b) tungsten(VI) bromide (c) magnesium telluride (d) rubidium nitride

Short Answer

Expert verified
(a) Y鈧係鈧�, (b) WBr鈧�, (c) MgTe, (d) Rb鈧僋.

Step by step solution

01

Identify Yttrium Sulfide Formula

Yttrium is represented by the symbol Y and has a charge of +3 (forming Y鲁鈦�). Sulfide comes from sulfur, represented by S, with a charge of -2 (forming S虏鈦�). Use the crisscross method to balance the charges: the formula for yttrium sulfide is Y鈧係鈧�.
02

Identify Tungsten(VI) Bromide Formula

Tungsten is represented as W and the Roman numeral VI indicates it has a charge of +6 (W鈦垛伜). Bromide is from bromine, represented by Br, with a charge of -1 (Br鈦�). To balance the charges, use six bromide ions: the formula for tungsten(VI) bromide is WBr鈧�.
03

Identify Magnesium Telluride Formula

Magnesium is represented by Mg and has a charge of +2 (Mg虏鈦�). Telluride comes from tellurium, represented by Te, with a charge of -2 (Te虏鈦�). Balancing the charges gives us a 1:1 ratio: the formula for magnesium telluride is MgTe.
04

Identify Rubidium Nitride Formula

Rubidium is represented by Rb and carries a charge of +1 (Rb鈦�). Nitride comes from nitrogen, represented by N, with a charge of -3 (N鲁鈦�). Three rubidium ions are needed to balance one nitride ion: the formula for rubidium nitride is Rb鈧僋.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Yttrium Sulfide
Yttrium sulfide is an interesting compound consisting of the rare-earth metal yttrium and sulfur. Yttrium, symbolized by Y, is not only essential in various industrial applications but also has notable chemical characteristics. As a group 3 element, yttrium typically loses three electrons, which results in a 3+ charge, represented as Y鲁鈦�.
Sulfide is derived from sulfur, an element that typically gains two electrons to form the sulfide ion with a 2- charge, denoted as S虏鈦�.
  • To determine the formula for yttrium sulfide, we use the crisscross method: Y contributes +3 and S contributes -2.
  • The charges cross over to balance each other out: Y鈧係鈧�.
This method helps ensure the compound is electrically neutral, resulting in the stable formula Y鈧係鈧�.
Tungsten Bromide
Tungsten bromide is a chemical compound that pairs tungsten with bromine. Tungsten, denoted by the symbol W, appears across various technologies and has a notably high melting point. In its +6 oxidation state, shown as W鈦垛伜, tungsten can form compounds such as tungsten(VI) bromide.
Bromine turns into bromide ions, expressed as Br鈦� with a -1 charge. The Roman numeral VI indicates that tungsten seeks to balance with six bromide ions.
  • In the crisscross method, W with a +6 charge needs six Br鈦� ions to balance.
  • The balanced formula becomes WBr鈧�.
This chemical formula reflects the need to maintain electrical neutrality within the ionic compound.
Magnesium Telluride
Magnesium telluride consists of the metallic element magnesium and the nonmetal tellurium. Magnesium, symbolized as Mg, regularly loses two electrons, achieving a +2 charge (Mg虏鈦�).
Tellurium forms the telluride ion by gaining two electrons, leading to a charge of -2 (Te虏鈦�). These balanced charges indicate a simple chemical formula.
  • Given their charges, a 1:1 ratio effectively balances the compound.
  • The resulting formula is MgTe, which is naturally stable.
This balanced 1:1 ratio highlights the straightforward nature of this compound as it doesn't require any charge adjustments.
Rubidium Nitride
Rubidium nitride is formed by combining rubidium, a soft, highly reactive alkali metal, with nitrogen. Rubidium is represented as Rb and carries a single positive charge: Rb鈦�. This is typical of Group 1 elements, which lose one electron.
Nitrogen, forming the nitride ion, gains three electrons to develop a -3 charge, represented as N鲁鈦�.
  • To achieve neutrality, three Rb鈦� ions are needed to balance the -3 charge of a single N鲁鈦� ion.
  • This gives us the formula Rb鈧僋.
The combination requires multiple rubidium ions, demonstrating how electrical balance is maintained in ionic compounds through stoichiometry.

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Most popular questions from this chapter

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List the following atoms in order of the ease with which they gain an electron to form an anion: $$ \begin{array}{lll} \mathrm{Br} & \mathrm{I} & \mathrm{H} \end{array} $$ Cl
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