Why does one electron in a potassium atom go into the fourth energy level instead of squeezing Into third energy level along with the eight already there?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.

Consider the reaction of a(g) + b(g) + c(g) => d(g) for which the following data were obtained: experiment initial [a], mol/l initial [b], mol/l initial [c], mol/l initial rate, mol/l.s 1 0.0500 0.0500 0.0100 6.25 x 10^-3 2 0.100 0.0500 0.0100 2.50 x 10^-2 3 0.100 0.100 0.0100 1.00 x 10^-1 4 0.0500 0.0500 0.0200 6.25 x 10^-3 what is the rate law for the reaction?