First slide

Atomic & physical properties

Question

P, X, A, Y, Q and D (Both Graphite and Diamond included) are the elements belonging to 14^th group of Modern periodic table. The correct trend of densityfor these elements is P < X < A < Y < Q < D. The element ‘X’ (or the allotrope of the element) in the sequence is

Moderate

A

Ge
B

Graphite
C

Diamond
D

Si

Solution

Atomic radius trend…C<Si<Ge<Sn<Pb;
IP₁and M.P trend…C>Si>Ge>Pb>Sn;
EN trend…C>Pb>Si=Ge=Sn;
Density…..C(graphite)<Si<C(diamond)<Ge<Sn<Pb;
B.P trend…C>Si>Ge>Sn>Pb;
Resistivity…C>Si=Ge>Pb>Sn;
Conductivity…C<Si=Ge<Pb<Sn

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