Unit 3 Part 3 - 2.2 The covalent model

Question 1

Rules of covalent bonds?

Answer 1

­ 1. between non­metals only
­ 2. elements bond by sharing valence electrons
­3. electronegativity difference is below 1.8
­4. electrons are shared to obtain a complete octet
­5. sharing of valence electrons leads to a variety of bonding combinations between the same
elements
6. octet rule because we are in the s + p block
­7. need the prefix system
­8. lower mp and bp
­9. do not conduct electricity as well as ionic compounds

Question 2

What are the diatomic elements?

Answer 2

H2 N2 O2 F2 Cl2 Br2 I2

Question 3

Single bond features?

Answer 3

Share two electrons
- C -C
- Bonded pair
- Weakest and longest

Question 4

Double bond features?

Answer 4

Share 4 electrons
- C - C
-

Question 5

Triple bond features?

Answer 5

Share 6 electrons
C - C
-
-
- Strongest and shortest