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Chapter 7: Problem 120

Give the name and formula of each of the binary compounds formed from the following elements. a. \(\mathrm{Li}\) and \(\mathrm{N}\) b. \(\mathrm{Na}\) and \(\mathrm{Br}\) c. \(\mathrm{K}\) and \(\mathrm{S}\)

Short Answer

Expert verified
a. The compound formed from Li and N is lithium nitride, with the formula \(Li_3N\). b. The compound formed from Na and Br is sodium bromide, with the formula \(NaBr\). c. The compound formed from K and S is potassium sulfide, with the formula \(K_2S\).

Step by step solution

01

a. Li and N

Lithium (Li) is an alkali metal with a valency of +1. Nitrogen (N) is an element in group 15 with a valency of -3. To find the formula of the binary compound formed between Li and N, we can use the cross-over rule. 1. Write the symbols of both elements with their valencies as superscripts: Li^+1 N^-3 2. Swap the valencies: Li^3 N^1 or Li3N Hence, the formula of the compound is Li3N. The name of this compound is lithium nitride.
02

b. Na and Br

Sodium (Na) is an alkali metal with a valency of +1. Bromine (Br) is a halogen with a valency of -1. To find the formula of the binary compound formed between Na and Br, we can use the cross-over rule. 1. Write the symbols of both elements with their valencies as superscripts: Na^+1 Br^-1 2. Swap the valencies: Na^1 Br^1 or NaBr Hence, the formula of the compound is NaBr. The name of this compound is sodium bromide.
03

c. K and S

Potassium (K) is an alkali metal with a valency of +1. Sulfur (S) is an element in group 16 with a valency of -2. To find the formula of the binary compound formed between K and S, we can use the cross-over rule. 1. Write the symbols of both elements with their valencies as superscripts: K^+1 S^-2 2. Swap the valencies: K^2 S^1 or K2S Hence, the formula of the compound is K2S. The name of this compound is potassium sulfide.

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Most popular questions from this chapter

An ionic compound of potassium and oxygen has the empirical formula KO. Would you expect this compound to be potassium(II) oxide or potassium peroxide? Explain.

Calculate the velocities of electrons with de Broglie wavelengths of \(1.0 \times 10^{2} \mathrm{~nm}\) and \(1.0 \mathrm{~nm}\), respectively.

An excited hydrogen atom with an electron in the \(n=5\) state emits light having a frequency of \(6.90 \times 10^{14} \mathrm{~s}^{-1}\). Determine the principal quantum level for the final state in this electronic transition.

Which of the following orbital designations are incorrect: \(1 s, 1 p\), \(7 d, 9 s, 3 f, 4 f, 2 d ?\)

In the ground state of element 115, Uup, a. how many electrons have \(n=5\) as one of their quantum numbers? b. how many electrons have \(\ell=3\) as one of their quantum numbers? c. how many electrons have \(m_{\ell}=1\) as one of their quantum numbers? d. how many electrons have \(m_{s}=-\frac{1}{2}\) as one of their quantum numbers?
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