Question 4
Draw the Lewis structures for the following molecules and ions: H2S, SiCl4, BeF2, 
, HCOOH
1) H2S H has 1 electron in its valence shell & sulphur has 6 electron its valence shell. A planar structure will be formed
2) Si has 4 electrons its valence shell & Cl need only 1 electron to complete its octet, therefore 4 Cl will make 4 bonds with Si.A tetrahedral shape will be formed
3) Be has 2 electrons in its valence shell & Fe has 2 electrons in its valence shell, so they make a planar structure
4) here C has 4 electron its valence shell, therefore it can make 4 bond with other atoms, whereas O has 6 electrons in its valence shell, it can accept 2 electron easily to complete its octet, therefore one O will make a double bond with C , while other two O will make 2 single bond with C.
5) HCOOH- C has 4 electron its valence shell, therefore it can make 4 bond with other atoms, whereas O has 6 electrons in its valence shell, it can accept 2 electron easily to complete its octet,
