What is the 4th element aside from liquids, solids, and gases.

One or more substances changing into one or more substances is an example of a

For the following dehydrohalogenation (e2) reaction, draw the zaitsev product(s) resulting from elimination involving c3–c4 (i. e., the carbon atoms depicted with stereobonds). show the product stereochemistry clearly. if there is more than one organic product, both products may be drawn in the same box. ignore elimination involving c3 or c4 and any carbon atom other than c4 or c3.

How are isotopes of the same chemical element alike? how are they different?