The ground state energy of hydrogen atom is $$-$$13.6 eV. Consider an electronic state $$\psi $$ of He⁺ whose energy, azimuthal quantum number and magnetic quantum number are $$-$$3.4 eV, 2 and 0, respectively.

Which of the following statement(s) is(are) true for the state $$\psi $$?

Ground state electronic configuration of nitrogen atom can be represented by

Which of the following statement(s) is (are) correct?

Decrease in atomic number is observed during