2. Why do bond angles compress when unbonded electrons are present around the central atom?

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

What is the mass of 0.46 mol of mgcl2

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.