The nonmetals helium, neon, and argon and the metals copper, silver, and gold are among only a few elements that are found in nature in their pure forms.

What can you infer about the
chemical reactivity of these elements?

Calculate the number of moles of ethane in 100 grams

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)