Question

say the answer in this a) and b) question​

Answer 1

Answer:

a) 2He denotes Two number of atoms.

b) O2 and Cl2 denotes Two molecules.

Explanation:

a) 2 number has given before the He (I.e. Helium) which indicates number of atoms.

b) Incase O2 and Cl2, position of number 2 indicates Two atoms of Oxygen and Two atoms of Chlorine binding to each other and making bond for molecule formation.