In his periodic table mendeleev did not list all of te elements in order of increasing atomic mass because he wanted to group together elements with similar

What is the chemical formula of the following compound

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

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.