The nature of bonding in Al_2Li_3 is: The effective number of atoms in a unit ce

Question

The nature of bonding in Al_2Li_3 is: The effective number of atoms in a unit cell of Na is: The close packed plane in Au is The close packed direction in Fe is: (100) [100] [110] [111] [111] None of the above The atomic packing factor in Ca is less than in Cu. True False A thermoset is a: a compound between electronegative and electropositive elements plastic that has a very high melting temperature plastic that can be melted and shaped once and then it cannot be melted. a ceramic with high melting temperature plastic that melts upon heating and solidifies upon cooling

Explanation / Answer

5) the lithium shares its electron in between the aluminium metal metal bond.

So primarily it is metallic

6) Sodium crystallizes into body centred cubic cell so the effective number of atoms = 2

7) It is FCC and it will be (111)

8) For iron 110

9)Copper : FCC

Calcium : FCC

False

10 ) a thermoset is a plastic that cant be remoulded again and again like thermoplastic

So option d is correct

Example : Bakelite

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