A part of the periodic table is shown. A portion of the sixteenth and seventeenth columns of the periodic table is shown. Column 16 reads eight oxygen, 16 sulfur, and 34 selenium. Column 17 reads nine flourine, 17 chlorine, and 35 bromine. (there is also a pic)

Which of the following elements is less reactive than the others?

Bromine (Br)
Oxygen (O)
Selenium (Se)
Sulfur (S)

Thanks again and I hope to see everyone again and again I apologise I didn't know you had mentioned

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

i think it's c. i'm not sure but i think so.