The length of time required for half of the radioactive atoms in a sample to decay is its. a. half-life. b. relative date. c. radioactive date. d. period.

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

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)

How can the periodic table be used to predict the behavior of elements?