Question

multiple - choice question which atom is smaller? bromine (br) chlorine (cl)

Explanation:

Atomic size decreases across a period and increases down a group in the periodic table. Bromine and chlorine are in the same group (Group 17 - halogens), and chlorine is above bromine. So, chlorine has fewer electron - shells, resulting in a smaller atomic radius.

Answer:

B. Chlorine (Cl)