reason four properties of thesc compounds.(n) The elements Li, Na and

1.	reason four properties of thesc compounds.(n) The elements Li, Na and K, each having one valence electron are placed in period 2, 3 and 4respectively of Modern Periodic Table(0 In which group of the Periodic Table should they belong?(i) Which one of them is least reactive?(i) Which cne of them has the largest atomic radius? Give reason to justify your answer in eachcase
Answer» Electronic configuration of Li, Na and K can be written as:Li → 2, 1Na → 2, 8,1K → 2, 8, 8, 1 (a) As all of them have only on electron in their valence shell they belong to Group 1. (b) Li is the least reactive among them due to its smallest size as it has only 2 shells. (c) K has the largest atomic radius among the three because it has maximum number of shells.Higher the number of shells, larger is the atomic radius.

reason four properties of thesc compounds.(n) The elements Li, Na and K, each having one valence electron are placed in period 2, 3 and 4respectively of Modern Periodic Table(0 In which group of the Periodic Table should they belong?(i) Which one of them is least reactive?(i) Which cne of them has the largest atomic radius? Give reason to justify your answer in eachcase

Answer»

Electronic configuration of Li, Na and K can be written as:Li → 2, 1Na → 2, 8,1K → 2, 8, 8, 1

(a) As all of them have only on electron in their valence shell they belong to Group 1.

(b) Li is the least reactive among them due to its smallest size as it has only 2 shells.

(c) K has the largest atomic radius among the three because it has maximum number of shells.Higher the number of shells, larger is the atomic radius.