Examples of Ionic Compounds
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Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal
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Give the IUPAC name of
- NaCl
- ZnS
- CaF2
- Na2O
The unit cell of a NaCl lattice
Has 4NaCl units
Is electrically charged
Hasions
Is body centered cube
Number of atoms per unit cell, if atoms are present at the corner of unit cell and two atoms at each body diagonal
In a face centred cubic cell, an atom at the face contributes to the unit cell
[Karnataka (Engg./Med.) 2000; AFMC 2001]
1/2 part
1/4 part
1/8 part
1 part
The number of atoms per unit cell in a primitive unit cell is:
1
8
6
12
In a normal spinel type structure, the oxide ions are arranged in ccp whereas 18 tetrahedral holes are occupied by Zn2+ ions and 50% of octahedral holes are occupied by Fe3+ ions. The formula of the compound is ?
Zn2Fe2O4
ZnFe2O3
Zn2Fe2O4
Zn2Fe2O2
- 2rCl−
- √2×(rNa++rCl−)
2(rNa+)- 2×(√2+1)rNa+
- Fe3+ ions are equally distributed between octahedral and tetrahedral voids
- Tetrahedral voids are equally distributed between Fe2+ and Fe3+
- Number of O−2 >Fe3+ > Fe2+
- Coordination number of Fe3+ = 8 throughout the unit cell