This is due to the fact that there is little food (flying insects) for them to eat. If they stayed awake in a warm home, without hibernating, then they would starve. We can begin the bat exclusion process during the winter months.
Mean free path of molecules in a gas. The molecules in a gas are assumed to be in continuous random motion making collisions with each other and with the walls of the container. The mean distance that the molecules travel between one collision and the next is called the mean free path of the molecules.
As the other answers have suggested, Hydrogen has only one proton, no neutrons, and uncharged, has one electron. However note that in nature, free hydrogen is found as a diatomic molecule (H2). Therefore, a hydrogen molecule has two protons, and 2 electrons (which form the bond between hydrogen atoms). In acidic solutions, hydrogen is found as the H+ ion (1 proton, 0 electrons), and is sequestered by water molecules to form the hydronium ion (H3O+).