Energy = 4Ah x 3600 seconds x 12 volts = 172,800 Joules
That depends on the characteristics of the battery. The numbers you quote don't give enough information. 4 Ah is simply a measure of the battery's total energy storage (for rexample, 1 ampere during 4 hours, at the specified voltage), not of how fast it can be released.
The second energy level of atoms can hold a maximum of 8 electrons.
8 maximum
8
8 electrons maximum
8
Maximum of 8 electrons in second energy level.
The second energy level can hold a maximum of 8 electrons. This is based on the formula 2n^2, where n is the principal quantum number representing the energy level.
it is in the second period. so boron has 2 energy levels
8
2
8 electrons