
Concept explainers
a)
Interpretation: Number of cannonballs, type of packing and type of regular geometry to be found.
Concept introduction
Closest packing: A metallic crystal containing spherical atom that are equally connected to each other in all direction. We can show such a structure by uniform packing in the way the sphere uses the vacant space. Closest packing are two types are Cubic close packing and Hexagonal close packing.
Cubic close packing: The arrangement of abc have cubic close packing. In this packing, unit cell made-up of four layers of atom. The top layer and bottom layer made-up of six atoms at hexagon’s corner and one at hexagon’s center.
Hexagonal close packing: In this packing, unit cell made-up of three layers of atom. The top layer and bottom layer made-up of six atoms at hexagon’s corner and one at hexagon’s center.
To explain total cannonballs needed.
b)
Interpretation: Number of cannonballs, type of packing and type of regular geometry to be found.
Concept introduction
Closest packing: A metallic crystal containing spherical atom that are equally connected to each other in all direction. We can show such a structure by uniform packing in the way the sphere uses the vacant space. Closest packing are two types are Cubic close packing and Hexagonal close packing.
Cubic close packing: The arrangement of abc have cubic close packing. In this packing, unit cell made-up of four layers of atom. The top layer and bottom layer made-up of six atoms at hexagon’s corner and one at hexagon’s center.
Hexagonal close packing: In this packing, unit cell made-up of three layers of atom. The top layer and bottom layer made-up of six atoms at hexagon’s corner and one at hexagon’s center.
To explain type of packing in cannonball.
c)
Interpretation: Number of cannonballs, type of packing and type of regular geometry to be found.
Concept introduction
Closest packing: A metallic crystal containing spherical atom that are equally connected to each other in all direction. We can show such a structure by uniform packing in the way the sphere uses the vacant space. Closest packing are two types are Cubic close packing and Hexagonal close packing.
Cubic close packing: The arrangement of abc have cubic close packing. In this packing, unit cell made-up of four layers of atom. The top layer and bottom layer made-up of six atoms at hexagon’s corner and one at hexagon’s center.
Hexagonal close packing: In this packing, unit cell made-up of three layers of atom. The top layer and bottom layer made-up of six atoms at hexagon’s corner and one at hexagon’s center.
To explain regular geometry of cannonball.

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Chapter 9 Solutions
Chemistry: An Atoms First Approach
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