Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Coordination number
Space lattice
None of these
Atomic packing factor

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Engineering Materials
Y-alloy contains

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

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