Answer:
Number 8 is D. Transition Metals and Number 9 is C. Atomic number.
Explanation:
8. All the highlighted ones are the only ones that have metals in them. Think about it, The right side contains gases like oxygen, so it can'y be A or B. Halogens are basically liquids like fluoride or chlorine.
9. Atomic Number would be 6
Atomic mass would be 12.0
And atomic symbol would be C.
