Question

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Answer 1

Answer:

a) Sodium and potassium. Sodium is in GROUP 1A and in 3RD PERIOD. Potassium is in GROUP 1A and in 4TH PERIOD.

b) Phosphorus. Phosphorus is in GROUP 5A and in 3RD PERIOD.

Answer 2

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.