Which sentence describes two atoms that form a covalent bond? A. The electronegativity of one atom is less than 1.7

B. The difference in their electronegativites is greater than 1.7

C. The electronegativity of one atom is greater than 1.7

D. The difference in their electronegativities is less than 1.7

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.)