Cho hợp chất MgO và hợp chất RCl3. R và O tạo thành hợp chất mới trong đó O chiếm 47% khối lượng hợp chất. Xác định R

The first element on the periodic table of elements is carbon. a. true b. false

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.

What is the molecular weight of copper