Question

in the quantum mechanical model of the atom,
electrons travel in circular paths called orbitals
electrons orbit the nucleus like planets orbit the sun
electrons can have any energy
both a and c
electron energies are quantized

question 25
all of the orbitals in a given electron shell have the same value as the quantum number, n.
angular momentum
magnetic
psi
principal
spin

Explanation:

1. In the quantum - mechanical model of the atom, electrons do not travel in circular paths called orbits (the Bohr model had this idea, but the quantum - mechanical model is more complex). Electrons do not orbit the nucleus like planets orbit the sun. Also, electrons cannot have any energy; their energies are quantized.
2. The principal quantum number \(n\) defines the electron shell. All orbitals in a given electron shell have the same principal quantum number \(n\). The angular - momentum quantum number \(l\) determines the shape of the orbital, the magnetic quantum number \(m_l\) determines the orientation of the orbital, the wave - function is represented by \(\psi\), and the spin quantum number \(m_s\) is related to the intrinsic spin of the electron.

Answer:

Question 1: electron energies are quantized
Question 2: principal