Shape of Molecules

Question 1

Electron pair repulsion theory

Answer 1

Shape is determined by electron pairs in outer shell. Covalent bond is a pair of electrons

Question 2

Linear structure

Answer 2

2 electron pairs around central atom.
Bond angle - 180

Question 3

trigonal planar structure

Answer 3

central atom with 3 pair bonding atoms around it (no lone pairs)
Bond Angle - 120

Question 4

Tetrahedral Molecule

Answer 4

Central atom with 4 bonding pairs
Bond angle - 109.5

Question 5

Trigonal Bipyramidal

Answer 5

Central atom with 5 bonding pairs
Bond angle - 120 and 90

Question 6

Octahedral

Answer 6

6 bonding pairs
Bonding pairs - 90

Question 7

Difference between lone pairs and bonding pairs

Answer 7

Lone pairs repel more strongly than bonding pairs.
Extra repulsion decreses bond angle by 2.5

Question 8

Non liner / v shape / Bent

Answer 8

2 bonding pairs. 2 lone pairs
Bond angle - 104.5

Question 9

Square planar

Answer 9

4 bonding pairs. 2 lone pair.
Bond angle - 90