Question

What type of solid (network, metallic, Group 8A, ionic, or molecular) will each of the following substances form?

a. Kr

b. SO₂

c. Ni

d. SiO₂

e. NH₃

f. Pt

Short answer

1. Group 8A solid
2. Molecular solid
3. Ionic solid
4. Network solid
5. Molecular solid
6. Metallic solid

Step-by-step solution

Step 1: Explanation for part (a)

At room temperature Krypton (Kr) retains in gas phase. It is one type of atomic solids under group A category. This type of solids form when atoms are binded weak London dispersion. Here Krypon falls under this category.

Explanation for part (b)

Solid sulfur dioxide (SO₂) is a polar molecular solid because the net dipole moment is non zero and constituent particles are molecules. The electronegativity of sulfur and oxygen are 2.5 and 3.5 respectively. Therefore, the sulfur-oxygen bonds are polar.

Explanation for part (c)

Nickel (Ni) is a transition metal present in a solid form at room temperature. This can be classified as an Ionic solid as nickel compounds are composed of positive and negative ions that are held together by electrostatic attractions which can be quite strong.

Explanation for part (d)

Silicon di oxide (SiO₂) is a covalent network solid that are formed by networks or chains of atoms or molecules held together by covalent bonds.

 Step 5: Explanation for part (e)  

Ammonia (NH₃) is a molecular solid as these are composed of molecules that held together by Vander walls force.

Explanation for part (f)

Platinum (Pt) is a metallic solid. The atoms within a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.