CRYSTAL

Question 1

crystal def

Answer 1

minerals (or other crystalline chemical compounds) with external shape bounded by smooth plane surface

Question 2

what holds crystals together

Answer 2

chemicals bonds

• covalent
• ionic
• metalic

Question 3

ionic bonding def

Answer 3

strong electorate attraction between positive/negative ions

elections exchanged between ions

e.g halite

Question 4

covalent bonding def

Answer 4

electrostatic attraction between a shared pair of electrons/nuclei of bonded atoms

e.g diamond

Question 5

metallic bonding def

Answer 5

strong electrostatic attraction between positive metal ions/delocalised electrons

e.g gold

Question 6

delocalised electrons

Answer 6

electrons from outer shell of metal atom, but not fixed to a particular atom so can move freely throughout structure

Question 7

van der Waals bonding def

Answer 7

weak bind resulting from residual electrostatic charges on units of structure

e.g graphite