Answer to Question #107899 in Chemistry for c

Question

Please predict the bond angles about the central atom in: Words to choose:bent,trigonometry planar,tetrahedral,trigonal bipyramidal,octahedral,0 non bonding pairs,1 non bonding pairs,2 non bonding pairs,109,5 degrees,120 degrees,180 degrees.Thanks.
. 4)CBr4:____Electron-domain geometry with_____on C.We confidently predict _____angles. 5)TeBr4:_____electron-domain geometry with_____on Te will cause the bond angles to deviate from ideal values.

Answer 1

4) Let's consider the electronic structure of the CBr₄ molecule. Its central atom, C, has 4 electrons in its valence shell (you can see this from the Periodic Table, 2s²2p²). Therefore, when four bromines share their four electrons with carbon, carbon atom has four electron pairs in the valence shell ( 4 pairs shared with bromines). In VSEPR notation, this molecule is described as AX₄, where A is the central atom (carbon) and X is the atom linked to the central atom (four bromines). The electron-domain geometry of AX₄ is tetrahedral. For this geometry, the angle is equal to 109.5°.

5) Let's consider the electronic structure of the TeBr₄ molecule. Its central atom, Te, has 6 electrons in its valence shell (you can see this from the Periodic Table, 5s²5p⁴). Therefore, when four bromines share their four electrons with tellurium, tellurium atom has five electron pairs in the valence shell ( 4 pairs shared with bromines and 1 non-bonding pair). In VSEPR notation, this molecule is described as AX₄E, where A is the central atom (tellurium), X is the atom linked to the central atom (four bromines) and E is the lone pair ( 1 electron pair in this case). The electron-domain geometry of AX₄E is trigonal bipyramidal (more exactly, seesaw).

Answer:  4)CBr₄: tetrahedral electron-domain geometry with 0 non-bonding pairs on C.We confidently predict 109.5 degrees angles.

5)TeBr₄: trigonal bipyramidal (more exactly, seesaw) electron-domain geometry with 1 non-bonding pair on Te will cause the bond angles to deviate from ideal values.