Question

Which best includes elements with the most similar chemical properties?

(1) Br, Ca, Hg (3) O, S, Se(2) Cr, Pb, Xe (4) N, O , F

Answer 1

Usually, elements with more similar properties share the same column on the periodic table.
Therefore, if you look at the periodic table, you can see that Oxygen, Sulfur, and Selenium all share the same column. Therefore, they all have similar properties

Answer: #3 ( O, S, Se )

Hope this helped!!! :D