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o Bours MomMic MODEL ostulate- 4. : nan alom electrons Yevolue avound the nucleus In a Ciftalay path which 1s ascodated with definite amount of energy. Only those Orbits a1 permitted for the revolving Of electron Which angulat momentum of the electyonig & whole number mulfple of that is angular momentum of the elechon= Wy = nh (Where N= |) 2)3,4-- atc) m= mass of tie 2bebon Ve velocity of the electron ve Yadius of the orbit he Planck's covstant.) fodulate-2 emt clechon evolves in any Selected abl, VE none P Absorbs energy, The energy of an O and when energy js Fm= inass of the electron Y Ne volocit centrifetal force = Centr fig fee of the elector iia _ wnvt oy 3 4 z 4 a4 7 N= a. = 2e ' me? x ee Fram @oln’s theory we _ m get mvr- nh aK 7 Nea mh . 20 mr 27 Ve othe —li) 4a wre From ean an. no.) & (2) we get Ze = wht PO aR aye mr =f Ye y h AK mzZer Key concept i) y= Osage fp i) Kakio of 1 Bay ate atom = My tt ; " ) Ralio of 'y tor two different atom’ ; Vy nr Of the vevolyiyg electYon in the ‘nth orbit From Bohr's theory we get Wye mh aK Ve mh Myr 7 Ve mh rt 2KM TT 7 ye jk AR Ree AS Y= Anmze’ i” he | -_ Ve onze” mn “ah © Neloci SO, Fy -2At med, zt “he ne Key concept : io =I - Ea = -13°6 2 eyatom! or Fy= 28x (0 95 atom" n 4a- llorg deve [rox lo tonisation Energy fom eneygy level values Toni sation Energy is the amount of energy which 1s yequuved 10 vemove the elecfvon from outermost Orbit of the atom (n the Faseous phase’. H (g)+1.€ —7 Ht(g)t é Sntact ronisaHon ene th gy di 2 y corresp poids to the energy diffevenc belween the 4round s Sate of the atom & tht erected” stale 95 1.0. TE= _ — E oe FasO 4 #. £6 = F(around state) For H-atom T£= —-€y = — [-248 X10" 19 5 atone) = 2s xio Os atom! °T.€ of H-like atom = [nelwn ze Ein’ \s the fivet excited state] °[ + Te = ke +e ° TE = -kKE Tee RE aR TE ke 7 
