The ABAB packing and ABCABC packing are respectively called as:

Engineering

Chemistry

Crystals and Unit Cells Types

HCP and CCP Parameters

Question

The ABAB packing and ABCABC packing are respectively called as:

hexagonal close packing (hcp) and cubic close packing (ccp)

cubic closed packing (ccp) and hexagonal closed packing (hcp)

body centered cubic (bcc) and hexagonal close packing (hcp)

hexagonal closed packing (hcp) and body-centered cubic (bcc)

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Solution:- Packing of lattice points in a crystal is of 2-types:-

1.) Cubic dose packing ( CCP)

2.) hexagonal close packing (HCP)

layers of packing sphere or lattice points in cep & hep are 3 .

CCP is ABCABC…... type
and

HCP is AB△BAB.... type.
Examples:-

Zinc blende (ZnS) (4 : 4) - ccp .

Wurtzite (ZnS) (4 : 4) - hcp .