Chapter8

Sailor uc san diego 18 periodic trends atomic radii

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: TRON AFFINITY Chem 6A Michael J. Sailor, UC San Diego 18 Periodic Trends: ATOMIC RADII Fig 8.8 TREND: • small on top, big on bottom • shrink going L to R, because nuclear charge is increasing w/o increasing n 22 19 Chem 6A Michael J. Sailor, UC San Diego Periodic Trends: ATOMIC RADII Fig 8.9 Chem 6A Michael J. Sailor, UC San Diego 20 Problem: Atomic Radius Rank the following set of main group elements in order of decreasing atomic size: Br, Rb, Kr, Ca, Sr Chem 6A Michael J. Sailor, UC San Diego 21 Solution: Atomic Radius Rank in order of decreasing atomic size: Br, Rb, Kr, Ca, Sr Elements with n = 4: Br, Kr, Ca Size increases going L->R, so big to small is Ca > Br > Kr Elements with n = 5: Rb, Sr Size increases going L->R, so big to small is Rb > Sr Chem 6A Michael J. Sailor, UC San Diego 22 Solution: Atomic Radius Rank in order of decreasing atomic size: Br, Rb, Kr, Ca, Sr Is Sr > Ca or is Ca > Sr? Sr > Ca, so the final ranking is Rb > Sr > Ca > Br > Kr 23 Chem 6A Michael J. Sailor, UC San Diego Periodic Trends: IONIC RADII Fig 8.20 Chem 6A Michael J. Sailor, UC San Diego 24 Periodic Trends: IONIC RADII Fig 8.21 Chem 6A Michael J. Sailor, UC San Diego 25 Periodic Trends: IONIZATION ENERGY and ELECTRON AFFINITY • IONIZATION ENERGY: A → A+ + e- • ELECTRON AFFINITY: A + e - → A- They are not the reverse of each other! Chem 6A Michael J. Sailor, UC San Diego 26 Periodic Trends: IONIZATION ENERGY Fig 8.10 27 Chem 6A Michael J. Sailor, UC San Diego Periodic Trends: IONIZATION ENERGY It is really hard to pull an electron from He Fig 8.11 It is really easy to pull an electron from Cs Chem 6A Michael J. Sailor, UC San Diego 28 Periodic Trends: ELECTRON AFFINITY Fig 8.13 Chem 6A Michael J. Sailor, UC San Diego 29 Periodic Trends: ELECTRON AFFINITY ELECTRON AFFINITY: Can be either exothermic or endothermic Chem 6A Michael J. Sailor, UC San Diego 30 Periodic Trends: SUMMARY Fig 8.14 31 Chem 6A Michael J. Sailor, UC San Diego Periodic Trends: IONIZATION ENERGY Fig 8.12 1st, 2nd, and 3rd ionization energies for Beryllium (Be) Why is 3rd I...
View Full Document

Ask a homework question - tutors are online