Answer:
(a) Alkali metals are
soft and reactive towards air and moisture. Therefore, are stored under
kerosene, e.g., sodium and potassium. Sodium metal (Na) is placed in group 1and
period 3 or potassium metal (K) is placed in group 1 and period 4
(b) Phosphorus shows
variable valency of 3 and 5. It is reactive towards air and not to wards water.
Therefore, it is stored under water Phosphorus is placed in group 15 and period
3.
(c) The
element, carbon (C) is tetravalent and is the basis of organic compounds. It is
placed in group 14 and period 2.
(d) The
lightest inert gas wish atomicnumber2 is helium (He).
It is placed
in group 18 and period 1.
(e) The
metal whose thin oxide layer (i.e., Al2O3) is used to
make other elements corrosion resistant by the process or anodizing s aluminium
(Al). It is placed in group 13 and period 3.
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