How many valence electrons are in the element copernicium?

will give !

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.

What is the formula of the ionic compound composed of calcium cations and chloride anions