Which statement about electrons and atomic orbitals is NOT true? A. An electron has the same amount of energy in all orbitals. B. An orbital can contain a maximum of two electrons. C. An electron cloud represents all the orbitals in an atom. D. An atom’s lowest energy level has only one orbital. I need also few words of explanation :)

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Well, A and D clearly contradict each other (D implies different levels of energy), so one of them is not true. This one immediately exclude B and C, which are thus correct. Well, the first layer is of lower energy while the second, third, fourth etc. are of higher energy (and also "sublayers" -- that's how they're called in my country anyway -- are arranged on different energy levels -- 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5f 6s 4f 5d 6p 7s 5f 6d 7p -- these are in this order). So, there is clearly a differentiation of energy, which lets A as false (and 1s has one orbital only, so D is true)

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