The maximum number of electrons in a shell with principal quantum number n = 3 is:

Heisenberg's uncertainty principle states:

The electronic configuration of Fe²⁺ (Z = 26) is:

Which quantum number determines the shape of an orbital?

Pauli's exclusion principle states:

Hund's rule states that:

The Aufbau principle determines:

The angular momentum of electron in 2p orbital is:

The number of radial nodes in 3s orbital is:

Emission spectrum of hydrogen was explained by:

The wavelength of matter wave is given by:

Cathode rays are:

Isotopes have same:

The orbital with n=4, l=1 is:

Rutherford's model couldn't explain:

The energy of 2s and 2p orbitals in hydrogen atom is:

Planck's equation relates energy of photon to:

The magnetic quantum number for d-orbital can have values:

Bohr's first orbit has radius:

Photoelectric effect was explained by: