Question

give reasons.,?a) atomic increased down the group. (B) first group elements are call alkali metal. (c) second group elements are called alkali earth metals(d) 17 group elements are halogem ( f ) the effective nuclear charge experienced by valencl etctrons is decrearing​

Answer 1

Answer:

a) In general, atomic radius decreases across a period and increases down a group.  Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.

b) All the Group 1 elements are very reactive . They must be stored under oil to keep air and water away from them. Group 1 elements form alkaline solutions when they react with water, which is why they are called alkali metals.

c) The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).