Non-Metals

Question 1

What type of bonding do Groups 1, 2, 3 (except Boron) and Transistion have?

Answer 1

All have metallic bonding

Question 2

The melting point and conductivity and strength all increase across a period. Why?

Answer 2

No. of delocalised electrons increases

Question 3

Properties of Metalloids of Groups 3, 4, 5

Answer 3

Giant covalent structures
V. high melting points and strength
Semi-conductors

Question 4

Allotropes of Carbon

Answer 4

Diamond- V. hard, poor electical conductor, good thermal conductor
Graphite- Layered structure, electrical conductor, VDW’s forces keep layers together
Bucky balls- Football shape, made into to tubes

Question 5

Properties of Non-metals of Groups 5, 6, 7

Answer 5

Small molecules with strong intramolecular covalent bonds
Mostly pairs of atoms, some slightly larger P and S
Low melting point due to weak VDWs forces
Non-conductors

Question 6

Properties of Group 8

Answer 6

Inert atoms-noble gases

At v. low temps, become liquids due to weak VDWs bonding