Atomic number of a few elements are given below 10, 20, 7, 14 (a) Identify the elements (b) Identify the Group number of these elements in the Periodic Table (c) Identify the Periods of these elements in the Periodic Table (d) What would be the electronic configuration for each of these elements? (e) Determine the valency of these elements

Answer:

(a) Elements are Neon (10) Calcium (20) Nitrogen (7) Silicon (14)

(b) Neon belongs to group 18, Calcium belongs to group 2, Nitrogen belongs to group 7 and Silicon belongs to group 14.

(c) Nitrogen and Neon belong to period 2. Calcium and silicon belong to Period 3.

(d) Electronic Configurations

Neon (Ne) = 1s2 2s2 2p6 = 2,8

Calcium (Ca) = 1s2 2s2 2p6 3s2 = 2, 8, 8, 2

Nitrogen (N) = 1s2 2s2 2p1 = 2, 5

Silicon (Si) = 1s2 2s2 2p6 3s2 3p2 = 2, 8, 4

Valency of the elements

  • Neon = 0
  • Calcium = 2
  • Nitrogen = 3
  • Silicon = 4

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