Beakers W, X, Y, and Z contain either aqueous NaOH, KOH, LiOH, or NH4OH. Which beaker contains aqueous ammonia if the light bulb glows brightly when testing the conductivity of beakers W, X, and Z

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.