Elements with atomic numbers 9, 17, 35, 53 are collectively known as

Elements with atomic numbers 9, 17, 35, 53 are collectively known as
Elements with atomic numbers 9, 17, 35, 53 are collectively known as
Elements with atomic numbers 9, 17, 35, 53 are collectively known as
Elements with atomic numbers 9, 17, 35, 53 are collectively known as

known