Lewis Structures

Question 1

Lewis Structures

Answer 1

• only show valence electrons
• ## should always be be arranged in pairs

Question 2

Lewis Structures for ions

Answer 2

• determine how many valence electrons there are
• draw the element symbol
• arrange valence electrons around symbol in pairs
• square brackets are needed as it is an ion

Question 3

Lewis Structures for Molecules

Answer 3

• determine how many valence electrons
• more than two atoms –> place the atom with the highest valency in the centre and the other atoms around it
• arrange electrons around atoms so that each atom ends up with the correct number of electrons

Question 4

Lewis Structures for polyatomic ions

Answer 4

• determine how many valence electrons
• use charge to determine if there are extra/fewer electrons
• higher valency atom goes in the centre
• each atom needs to right number of electrons
• square brackets and charge in right hand corner