Metallic bonding

Question 1

metals typically have the following physical properties:

5 items

Answer 1

high melting temperatures
good electrical conductivity
good thermal conductivity
malleability
ductility

Question 2

all theories of the way that the atoms in a metal are bonded together must explain

Answer 2

the properties of metals

Question 3

metals typically have…,.or…………electrons in the outer shell

Answer 3

one, two or three electrons in the outer shell

Question 4

metals typically have…….ionisation energy

Answer 4

low

Question 5

the electrical conductivity of a metal generally…………. as the number of outer-shell electron

Answer 5

increases

Question 6

delocalised electrons are

Answer 6

electrons that are not associated with any single atom or any single covalent bond

Question 7

delocalised electrons are free to

Answer 7

move, they are localised, between any pair of cations

Question 8

metallic bonding is

Answer 8

the electrostatic force of attraction between the nuclei of metal cations and delocalised electrons

Question 9

in order to melt a metal it is necessary to

Answer 9

overcome the forces of attraction between the nuclei of the cations and the delocalised electrons to such an extent that the cations are free to move around the structure

Question 10

metals have a …………………….structre

Answer 10

giant lattice

Question 11

the number of delocalised electrons per cation determines

Answer 11

the melting point of a metal

Question 12

group 1 metals have……………..melting temperatures

Answer 12

low

Question 13

group 2 metals have …………………….melting temperatures

Answer 13

higher

Question 14

metals in the d-block typically have ………………………..melting temperatures as they have

Answer 14

high as they have more delocalised electrons per ion

Question 15

a metal with a relatively small cation (ionic radius) will have a

Answer 15

higher melting point as the delocalised electrons are closer to the nucleus, so the force of attraction is greater

Question 16

when a potential difference is applied across the end of a metal, the delocalised electrons will

Answer 16

be attracted to and move towards the positive terminal of the cell, creating a movement in electrical charge, an electric current

Question 17

the two factors which determine the ability of thermal conductivity in a metal are

Answer 17

• the free-moving delocalised electrons pass kinetic energy along the metal
• the cations are closely packed and pass kinetic energy from one cation to another

Question 18

malleability is

Answer 18

whether a metal can be hammered into shape

Question 19

ductility is

Answer 19

whether a metal can be drawn into a wire

Question 20

when stress is applied to a metal, the layers of cations

Answer 20

slide over each other and the delocalised electrons with them