Question

Which of the following groups of elements are likely to be radioactive? (5 points) a Actinides b Noble gases c Transition metals d BCNOs

Answer 1

Actinides

Step-by-step explanation:

Actinides are radioactive and human-made elements.

Answer 2

Actinides

Step-by-step explanation:

They are defined as "any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence"