Which of the following is not present in skeletal structures?

Which other elements contain the same number of outer electrons as sodium

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.

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2