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Wave Optics
Question
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If electron-orbits with principal quantum number n > 3 were not allowed, what would be the number of possible elements?

Answer

The maximum number of electrons that can be accommodated in orbits with n = 3 is
2 × 12 + 2 × 22 + 2 × 32 = 28.

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Some More Questions From Wave Optics Chapter

In the ground state of __________ electrons are in stable equilibrium, while in __________ electrons always experience a net force. (Thomson's model/Rutherford's model).

A classical atom based on __________ is doomed to collapse. (Thomson's model/Rutherford's model)

An atom has a nearly continuous mass distribution in a _____________ but has a highly non-uniform mass distribution in __________ (Thomson's model/Rutherford's model)

The positively charged part of the atom possesses most of the mass in ___________ (Rutherford's model/both the models).

Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?