Question

why are the electrons of the helium atom not all in the 1s state. Which of...

why are the electrons of the helium atom not all in the 1s state.

Which of the following choices best explains this observation?
Coulomb's law
the Pauli exclusion principle
the Einstein quantum entanglement principle
Rutherford's explanation of atomic structure
the Heisenberg uncertainty principle

2.)There is a singly-ionized helium atom, which has 2 protons with its remaining electron in the ground state.

Using the Bohr model calculation, determine the maximum wavelength in nanometers for a photon that could remove the remaining electron from this atom.
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