Answer:
H2S has a bent geometry, while BeH2 has a linear geometry because: presence of lone pair in H2S
Absence of Lone pair in BeH2
Explanation:
Structure of H2S :
Atomic number of S = 16 = 1s(2 )2s(2) 2p(6) 3s(2 )3p(4)
Outer most shell has 6 electron
Valence electron (Involved in bonding) = 6
Out of these 6 electrons ,
2 electrons are formed in bonding with Hydrogen
Rest 4 are non- bonding and present as lone - pair
H2S exist - sp3 hybridisation
There are 2-Lone pair on S in H2S (look at the image attached)
Structure of H2S :
Atomic number of Be = 4 = 1s(2 ) 2s(2)
Valence electron (Involved in bonding) = 2
These 2- electron are involved in bonding with two Hydrogen and form liner shape.*Form sp - hybridized
Hence shape is linear because it has non - lone pair.
VSEPR : According to this theory lone pair causes repulsion to the bond and cause unstability in the molecule.
Hence the bonds shifts away from lone pairs . This is why H-S bonds in H2S shifts way from lone pair
