Final answer:
The question about the hydrogen atom being 'only 8400' cannot be addressed accurately without additional context or units. Discussions of hydrogen atoms typically involve Bohr's model, the Bohr radius, and isotopes like deuterium and tritium. The Bohr Theory accurately predicts energy levels in hydrogen-like atoms.
Step-by-step explanation:
The original question "On average, a hydrogen atom is only 8400?" lacks sufficient context and appears to be incomplete, making it difficult to determine whether it is true or false. However, we can address various aspects of hydrogen atoms using Bohr's model of the hydrogen atom and other related concepts. The Bohr radius for hydrogen, which represents the size of the electron's orbit in Bohr's model, is approximately 0.529 Å or 52.9 picometers. The statement could possibly be referring to the average distance between two hydrogen atoms in a particular state, but without proper units or context, the statement's accuracy cannot be assessed.
The hydrogen atom, with an atomic number (Z) of 1, has a simple structure with one electron orbiting a single proton. According to the Bohr Theory, energy levels in hydrogen-like atoms can be accurately predicted, with the ground state energy being around 13.6 eV. When considering two intact hydrogen atoms 10 cm apart, gravitational forces act upon them, though they are incredibly weak. The electromagnetic force can also be considered negligible in this scenario due to the neutral charge of the atoms, and the strong force is irrelevant at such distances.
Regarding hydrogen isotopes, we have the most common form with just a proton in the nucleus, deuterium with a proton and a neutron, and the rare tritium with a proton and two neutrons. These different isotopes have various applications in fields such as chemistry and physics.