How many atoms are in 121 g of calcium?

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Connect the whole numbers on the periodic table to indicate what they represent?