Question

Question 20 Answer only in lower case, use numerals to represent numbers Consider the molecule CS2. 1) What is the total number of valence electrons 2) What is the total number of valence electrons around C after bonding? 3) What is the 3-D molecular shape (molecular geometry) of the molecule? 3b) What is the electron geometry of the molecule? 4) How many electron groups are around the central atom? 5) How many lone pairs are around the central atom?

Answer 1

1.). Total number of valence electrons in CS2 are 16

Total number of valence electrons are electrons carried by all elements in compound

Carbon being a central atom form two double bonds with Sulfur atoms.

Valence electrons of Carbon atom is 4 and valence electrons of Sulfur is 6

Thus Total Valence electrons are

CS2 = 4 + 2(6) = 16 electrons.

2). Total number of valence electrons of C are 8

Carbon has 4 valence electrons and 2 double bonds with Sulfur which will share total of 4 electrons .

Thus shared electrons also count in valence electrons.

C = 4+4 = 8 valence electrons.

3). Molecular geometry of CS2 is Linear Geometry.

3). b). Electronic Geometry of CS2 is Linear Geometry because there is no lone pair present on Central atom Carbon.

4). There are 4 electron group around central atom Carbon

5). There are no lone pair present on Central Carbon atom.

CS Linear Electronic Configuration of c- 25² 26²- Electronic configuration of sh 35 3pr. 0 Total valence electron of CSg. 4+2 (6) - 16 elections s=0=s. Linear Geometry 2 Total electron around Catom. = 4 (valeme e of c) + 4 (shared by s) - s electrons. & Molecular geometry of Ch wear Geometry 6) Electronic geometry - Linear. 4.) Total electron groups around caten SCRS 4 electron groups. 5. Love Pairs around c atem. 3 wa zero.