Bohr orbit to the fifth Bohr orbit and what is the wavelength of the light emitted when the electron returns to the ground state? The ground state electron energy is – . × – ergs. .
The electron energy in hydrogen atom is given by E n = (– . × – )/ n J. Calculate the energy required to remove an electron completely from the n = orbit. What is the longest wavelength of light in cm that can be used to cause this transition?
. Calculate the wavelength of an electron moving with a velocity of . × m s – . .
The mass of an electron is . × – kg. If its K.E. is .
× – J, calculate its wavelength. . Which of the following are isoelectronic species i.e., those having the same number of electrons? Na + , K + , Mg + , Ca + , S – , Ar.
. (i) Write the electronic configurations of the following ions: (a) H– (b) Na+ (c) O2– (d) F– (ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) 3s1 (b) 2p3 and (c) 3p5 ? (iii) Which atoms are indicated by the following configurations ? (a) [He] s (b) [Ne] s p (c) [Ar] s d .
. What is the lowest value of n that allows g orbitals to exist? . An electron is in one of the d orbitals.
Give the possible values of n , l and m l for this electron. . An atom of an element contains electrons and neutrons. Deduce (i) the number of protons and (ii) the electronic configuration of the element.
. Give the number of electrons in the species . (i) An atomic orbital has n = . What are the possible values of l and ml ?
(ii) List the quantum numbers ( ml and l ) of electrons for 3d orbital. (iii) Which of the following orbitals