CHEM101 Lecture : Chem 101 Lecture September 13.docx

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

Atomic spectra hydrogen and similar atoms: h atom: 1e 1p+, z=1, bohr model states one electron orbiting a positive nucleus, h like atoms are really ions i. e. : helium contains 2e 2p+ more than one electron. 2) (1/ni therefore only transitions between these energy levels can be observed n=1 n= is complete removal of electron (ionization: e=hc/ = rhz2[(1/nf, emission spectrum means ni > nf, absorption spectrum means ni < nf, one of. , z, ni, or nf will need to be determined when solving related problems: when solving these problems, determine n values by context of question and assumptions regarding changing wavelength that corresponds to changing energy; then determine value of z and locate element corresponding to this number (atomic number) on periodic table, removing electron completely, e = rhz2[(1/nf, for hydrogen: n=1 n= z=1 and when plugged into equation we are left with rh, for helium: we cannot calculate the first ionization energy because we have 2.