Anonymous

R

Anonymous

I think C

Anonymous

Electron configuration ..... The electron configuration of tin (Sn ... Z = 50) 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6 4d10, 5s2 5p2 --------------------- ---------------------------| ............. the inert gas core .....the electron configuration of Kr Short form of the electron configuration for tin [Kr] 4d10, 5s2 5p2 Note: You might be tempted to write the electron configuration as [Kr] 5s2, 4d10, 5p2. Don't. Because despite what you may have read or heard from your teacher, that isn't right. It follows a misconception taught along with the Aufbau principle that suggests that the ns sublevel is lower in energy than the (n-1)d sublevel. That simply isn't always the case. Occupied (n-1)d-sublevels are lower in energy than ns-sublevels. To learn more read the article linked below, or look at the graph of energy vs Z which accompanies the article and shows the "collapse" of the d-orbitals. The full article may be accessed from https://www.researchgate.net/publication... .

Anonymous

'C' ; [Kr]