Explanation:
atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed
16
8 + 8 = 16
2 + 2 + 2+ 2 + 2+ 2 + 2 + 2 = 16
The methane molecule is held together by the four strong C–H carbon–hydrogen covalent bonds by sharing electrons. Note that the inner shell of carbon's electrons are not shown above, only the outer shell of carbon's electrons are involved in the covalent bonding.
fractional distilation because the solvent will evaporate and pass through the condenser and the sonvent will be in the beaker while the solute remains in the round bottomed flask
because people didn't have the right equipment to find more... hope this helped