Why did mendeleev put bromine (br) and chlorine (cl) in the same group on the periodic table they have similar masses. they have similar properties. they are both gases. they are similar alphabetically.

they have similar properties

ch3 [ch2]14cooh

explanation:

explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.