While looking at strontium (Sr) on the periodic table, a student needs to find an element in the same period but with a greater atomic mass. Where should the student look?

directly up to calcium (Ca)
directly down to barium (Ba)
directly to the left at rubidium (Rb)
directly to the right at yttrium (Y)

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)