Would an element with 7 valence electrons be more or less reactive than an element with 3 valence electrons?

Why are people not able to scuba dive in the deep part of the ocean

Which formula can be used to calculate the molar mass of hydrogen peroxide

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.