3) Unit 1 - Shapes of Molecules and Polyatomic ions

Question 1

what is a dative bond and give an example

Answer 1

when one atom in a covalent bond provides both the elctrons

NH4+

Question 2

What are the steps when drawing the shape of a molecule

Answer 2

• number of outer electrons on central atom
• • electron for each atom attached to central atom
• -charge for polyatomic ions
• ANS / 2 =number of bonding pairs
• number of bonding pairs - original atoms attached = number of lone pairs

Question 3

if the total number of electron pairs

2
3
4
5
6 
what is the name of the shape of the molecule

Answer 3

2 = linear
3 = triganol
4 = tetrahedral
5 = triganol bi-pyramidal
6 = octahedral