Atomic number of a few elements are given below 10,20,7,14 (a) Identif

1.	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) (i) At. no. 10→ Neon (ii) At no. 20 → Calcium (iii) At no. 7→ Nitrogen (iv) At no. 14→ Silicon (b) (i) Group of Neorr→ 18th Group (ii) Calcium→ 2nd Group (iii) Nitrogen→ 15th Group (iv) Silicon→14th Group (c) Period number (i) Neon- 2nd Period (ii) Calcium- 4th period (iii) Nitrogen - 2nd period (iv) Silicon - 3rd Period (d) Neon - 2, 8 Calcium -2,8,8,2 Nitrogen - 2, 5 Silicon -2,8,4 (e) Valency Neon - Zero Calcium - 2 Nitrogen - 3 Silicon-4.

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) (i) At. no. 10→ Neon

(ii) At no. 20 → Calcium

(iii) At no. 7→ Nitrogen

(iv) At no. 14→ Silicon

(b) (i) Group of Neorr→ 18th Group

(ii) Calcium→ 2nd Group

(iii) Nitrogen→ 15th Group

(iv) Silicon→14th Group

(c) Period number

(i) Neon- 2nd Period

(ii) Calcium- 4th period

(iii) Nitrogen - 2nd period

(iv) Silicon - 3rd Period

(d) Neon - 2, 8

Calcium -2,8,8,2

Nitrogen - 2, 5

Silicon -2,8,4

(e) Valency

Neon - Zero

Calcium - 2

Nitrogen - 3

Silicon-4.