For the hypothetical compound AX3, which statement is true? (Need help ASAP)

A is a metal from Group 3A, and X is a nonmetal from Group 7A.

A is a metal from Group 1A, and X is a metal from Group 7A.

A is a nonmetal from Group 3A, and X is a metal from Group 1A.

A is a metal from Group 3A, and X is a nonmetal from Group 5A.

Using the periodic table, complete the table to describe each atom. type in your answers

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

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)