Calculate the wavelength for the ẻmission transition if it starts from the orbit hav- ing radius '1.3225 nm' and ends at '211.6 pm'. Name the series to which this transition belongs and the region of the spectrum.

Emission transitions in the Paschen series end at orbit n=3 and start from orbit n and can be represented as v=3.29 xx 10^(15) (H z) [1 / 3^2-1/ n^2] : Calculate the yalue of 'n' if the transition is observed at 1285nm. Find the region of the spectrum.

Presence of unpaired electrons makes a species paramagnetic. Each unpaired electron has a magnetic moment associated with its spin angular momentum and orbital angular momentum. For the compounds of the first series of transition metals, the contribution of the orbital angular momentum is effectively quenched and hence is considerably important. For these, the magnetic moment is determined by the number of unpaired electrons and is calculated by using the spin-only formula, i.e., mu = sqrt(n(n+2)) where n=number of unpaired electrons and mu =magnetic momentin (in Bohr magneton, B.M.). If n=1, then mu = 1.73 B.M . Which one of the following transition metal ions is paramagnetic?

Neils Bohr was the first to explain quantitatively the general features of hydrogen atom structure and its spectrum. Calculate the wave number of radiation due to transition of an electron from fourth orbit to second orbit. ( R_(H) =109677 cm^(-1) )

Neils Bohr was the first to explain quantitatively the general features of hydrogen atom structure and its spectrum. Calculate the wave number of radiation due to transition of an electron from fourth orbit to second orbit (R_h=109677cm^-1)