Which statement about niels bohr's atomic model is true? o higher orbits have lower energies. each orbit has a specific energy level. electrons can exist in any energy level. o orbits close to the nucleus have no energy.

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Explanation:

Actually, two of the listed statements are correct with respect to the Bohr Model of the atom. Orbitals are defined by specific energy levels relative to the nucleus of the atom that it is associated and electrons can exist in any energy level.

That is, the bases of the Bohr (Concentric Ring) Model of the atom is found in the study of bright line emission spectra of atoms (hydrogen to be specific) in that the bright lines of the spectrum generated are caused by electrons transitioning from higher energy level orbitals to lower energy level orbitals releasing 'discrete' amounts of energy in the form of electromagnetic radiation. The potential energy content of an electron while in a specified energy level (As described by Neils Bohr et.al.) is given by the expression Eₙ = -A/n²; A = 2.18 x 10⁻¹⁸ joules.  When applied to electron transitions, say from the n = 3 level to the n = 2 level, the energy emitted (ΔE₃→₂ = -2.18 x 10⁻¹⁸J(1/2² - 1/3²) = -2.03 x 10⁻¹⁹j. This is the energy carried by a photon having a wavelength of 656.1-nm and can be seen as a red-light band in the bright line spectrum of the Hydrogen atom.

the answer is option a.