S2.3 metallic model

Question 1

metallic bond

Answer 1

electrostatic attraction between a lattice of positive metal ions and a sea of delocalized electrons

Question 2

Why TM have different oxidation states

Answer 2

can either donate d or s orbital electrons

Question 3

melting point of TM

Answer 3

• very high
  => strong metallic bond

Question 4

Why TM have strong metallic bonds

Answer 4

can contribute more electrons from both d and s orbital
=> increases as d orbitals increase
=> stronger electrostatic attraction between cation & del. elec.

Question 5

Properties of TM

Answer 5

• hardness
• high mp. & b.p = metallic bond
• conductivity = deloc. e

Question 6

Alloy exmaple & composition

Answer 6

brass = copper & zink = instrument
stainless steel = iron, chormium, nickel = cutlery