Describe the trends in electron configuration in the periodic table by selecting the terms from the drop-down menus.

the number of valence electrons from the left to right across a period.
the number of valence electrons from the top to the bottom of a group.
electrons are added into the outermost in groups 1 and 2.
electrons are added in the outermost in groups 3 through 12.
electrons are added in the outermost in groups 13 through 18.

What effect does nuclear radiation have on atoms?

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

14. complete and balance the equations for the single displacement reactions. a. zn + pb(no3)2 -> b. al + niso4 -> 15. complete and balance the equations for the double displacement reactions. a. agno3(aq) + nacl(aq) -> b. mg(no3)2(aq) + koh(aq) -> 16. complete and balance the equations for the combustion reactions. a. __ ch4 + o2 -> b. __ c3h6 + o2 -> c. + o2 ->