There are 4 quarts in a gallon. So 2(Gallons)*4(Number of quarts per gallon) equals 8. Then we have 1/4th left, since there are 4 in each gallon, this 1/4th is a quart. Long explanation short......2*4=8+1=9
Carbon-12 has the following electron configuration: 1s2-2s2-2p2. As seen in the configuration, the right answer is: the first electron shell has 4 orbitals.
