Which of the following exists as covalent crystals in the solid state?
Iodine
Silicon
Sulphur
Phosphorus
Silicon exists as covalent crystals in the solid state.
The element which is stored under kerosene is
(a) sulphur
(b) phosphorus
(c) sodium
(d) silicon
Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.
(i) Tetra phosphorus decoxide (P4O10) (vii) Graphite
(ii) Ammonium phosphate (NH4)3PO4 (viii) Brass
(iii) SiC (ix) Rb
(iv) I2 (x) LiBr
(v) P4 (xi) Si