Question

12. Which among the following is not considered as triad ?

a. Calcium( 40), strontium (87.6), barium (137.6)

b. Lithium( 7.0), sodium (23.0), potassium (39.0)

c. Carbon (12.0), nitrogen (14.0), oxygen (16.0)

d. Chlorine (35.5), bromine (80.0), iodine (127.0)​

Answer 1

Explanation:

b option is the correct answer