(1) The element Francium is extremely rare and very little is known about its chemical and physical properties. Use the following data to estimate its density and
ionization energy:
Rb
Cs
Density (g/cm
0.86
Ionization energy (KJ/mol) 419
1.53
403
1.87
375
(i) State the group and period of the periodic table to which the following two
elements belong?
( Xe 6s-45d2
(B) [Ne] 3s 3p

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.)