unit 3 defenitions

Question 1

define giant metallic lattices (2)

Answer 1

• strong electrostatic forces of attraction
• between cations and delocalised e-

Question 2

define giant covalent lattices (2)

Answer 2

• strong electrostatic attraction between positively charged nuclei
• and shared paire(s) of e-‘s

Question 3

define simple covalent molecule (2)

Answer 3

• strong electrostatic attraction
• between positively charged nuclei and shared pair of e-‘s

Question 4

define periodicity (3)

Answer 4

• repeating trends
• in physical and chemical properties
• across periods of periodic table

Question 5

define first ionisation energy (2)

Answer 5

• energy required to remove one mole of electrons
• from 1 mole of gaseous atoms

Question 6

define successive ionisation energies (3)

Answer 6

• energy required to remove each electron
• one by one
• from one mole of gaseous atoms / ions

Question 7

define second ionisation energy (2)

Answer 7

• energy required to remove one mole of electrons
• from 1 mole of gaseous +1 atoms