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Chapter 12: Problem 12

Indicate the type of crystal (molecular, metallic, ionic, or covalent-network) each of the following would form upon solidification: (a) InAs, (b) \(\mathrm{MgO},\) (c) \(\mathrm{HgS},\) (d) \(\mathrm{In},\) (e) \(\mathrm{HBr}\).

Short Answer

Expert verified
(a) InAs forms a covalent-network crystal. (b) MgO forms an ionic crystal. (c) HgS forms an ionic crystal. (d) In forms a metallic crystal. (e) HBr forms a molecular crystal.

Step by step solution

01

(a) Identify crystal type of InAs

InAs consists of In (Indium, a metal) and As (Arsenic, a non-metal) elements. When a metal and a non-metal are combined, they tend to form a covalent bond. Therefore, InAs forms a covalent-network crystal.
02

(b) Identify crystal type of MgO

MgO is composed of Mg (Magnesium, a metal) and O (Oxygen, a non-metal). Mg has a low electronegativity, and O has a high electronegativity. When a metal and a non-metal with significantly different electronegativities are combined, they tend to form an ionic bond. Therefore, MgO forms an ionic crystal.
03

(c) Identify crystal type of HgS

HgS is composed of Hg (Mercury, a metal) and S (Sulfur, a non-metal). Similar to the case of MgO, HgS consists of a metal and a non-metal with significantly different electronegativities. Thus, HgS forms an ionic crystal.
04

(d) Identify crystal type of In

In (Indium) is a metal, and as a pure substance, it will form metallic bonds with its neighboring atoms. Therefore, In forms a metallic crystal.
05

(e) Identify crystal type of HBr

HBr is composed of H (Hydrogen, a non-metal) and Br (Bromine, a non-metal). Non-metals tend to form covalent bonds, and HBr is a diatomic molecule. Since HBr is a polar molecule, it will have a dipole-dipole interaction with neighboring HBr molecules. As such, HBr forms a molecular crystal.

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Most popular questions from this chapter

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