Which electron configuration could represent the electrons in a sodium atom in an excited state? (1) 2-8
(2) 2-8-17
(3) 2-7-1
(4) 2-7-2

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

If two objects at different te,peraure are in contact with each other what happens to their temperature

Which subshell is represented by the actinides family?