Sulfur has an atomic number of 16. what would be the valence number of this element?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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 many neutrons does a atom of cobalt have?