Calculate the frequency in Hz of orange colour light having wavelength 600 nm .

$$ \left[\mathrm{C}=3 \times 10^8 \mathrm{~ms}^{-1}\right] $$

"Pairing of electrons in the orbitals belonging to the same subshell does not occur unless each orbital belonging to that subshell has got one electron each." This statement is known as

"It is impossible to determine simultaneously the exact position and exact momentum of an electron." This statement is called

Which of the following elements contains maximum number of unpaired electrons?