Bonding and structure Flashcards
Metallic materials have a….
Sea of delocalised electrons
Delocalised electrons conduct as a….
Liquid and a solid
Only metallics are….and…
Malleable and conduct as a solid and liquid
Covalent materials are…
Poor conductors of electricity both as a liquid and a solid
Ionic materials are…
Poor conductors of electricity as a solid but good conductor as a liquid
Ionic materials have a….melting point
high
Covalent materials have a…..melting point
low
2 examples of why something is hard.
Difficult to scratch, layers are held tightly in fixed positions.
What does it mean when something is brittle?
Snaps when bending, bending distorts the lattice structure. structure snaps.
Why do ionic materials conduct as a liquid but not a solid?
solid: ions are held tightly in fixed positions ions aren’t free to move therefore cannot conduct a charge.
Liquid: Lattice structure broken down, ions are free to move, therefore can conduct.
Why is silver mallleable
-Metallic lattice
-Sea of delocilised electrons
-when bent, electrons prvent like charges from coming together
-no repulsive force
-Malleable
Why is silver nitrate brittle
-ionic structure
-bending distorts the lattice
-like charges come together
-greater repulsive forces
-lattice snaps
Why is the melting point of oxygen much lower than magnesium oxide?
Oxygen has a molecular structure, weak forces of attraction between molecules, low melting point.
Magnesium oxide has an ionic structure, ions are held tightly in fixed positions therefore a lot of energy is required to break the ionic bonds —high melting point
how many electrons in chlorine atom with an atomic number of 17?
17
How many protons in a chlorine atom if atomic number is 17?
17
