Which pair of atomic number represents S- block elements ? options are (1) 7,15 (2)6,12 (3) 9,17 (4) 4,12
Answers
Answer:
(4,12) is the correct answer
Answer:(4) 4,12
Explanation:
Under s-block the following elements are present :-
Atomic no. - element.
1. Hydrogen
2. Helium
3. Lithium
( 4. Beryllium )
11 . Sodium
( 12. Magnesium )
19. Potassium
20. Calcium
37. Rubidium
38. Strontium
55. Caesium
56. Barium
87. Francium
88. Radium