Help me Benjamin please

1...option B

2... peroids

3..group

4.. metals

5...7

6...dmitri mendeleev

7.. xenon

8... compound can be broken down by physical means

9... they can be broken down into simpler substance

sry if its wrong

last two 8th and 9th i do t think ots correct

1.) Atomic number

2.) Groups

3.) Period

4.) Metals

5.) 7

6.) Dmitri Mendeleev

7.) I think it's Chromium

I don't know the rest

the answer would be c