Bonding,Structure and Properties of Matter Flashcards
What are ion?
charged particles
what do metal form?
forms positive ions
what do Non-metal form?
forms negative ions
What does group 1 and 2 elements form?
forms positive ions (cations)
group 1 –> +1
group 2 –> +2
What does group 6 and 7 elements form?
forms negative ions (anions)
group 6 –> -2
group 7 –> -1
advantages and disadvantages of dot and cross diagram?
1 adv and 1 disadv
Adv
–> good for showing how ionic compound are formed
Disadv:
–> don’t show the structure of the compound or the size of the ions or how they are arranged
Which force does regular lattices have?
electrostatic force
what is an giant ionic lattice?
ionic structure that has strong electrostatic forces of attraction between oppositely charged ions in all direction in the lattice
What are the properties of ionic compounds?
- -> high melting melting points and high boiling points - strong bonds between ions
- -> can’t conduct electricity when solid - ions are not free to move
- -> conducts electricity when melt - ions are free to move
- ->also conducts electricity when they dissolve in water
what happens ionic bonding?
In ionic bonding, a metal atom transfers electrons to a non-metal atom, allowing both of them (the metal and non-metal) to have a full outer electron shell.
when do covalent bond forms?
Covalent bonds are formed when 2 non-metal atoms share pairs of electrons. Covalent bonds are strong because the shared electrons are attracted to the nucleus of both atoms
how can we draw covalent bonds?
3 model
1) dot and cross diagram
- -> shows which atoms
- ->doesn’t show relative sizes of atoms
- -> doesn’t show how they arranged
2) displayed formula
- ->show how atoms are connected in large molecules
- -> doesn’t show 3D structure of the molecule
- -> doesn’t show the electrons
3) 3D model
- ->shows the atoms, covalent bonds and their arrangement
- ->can get confusing
- -> doesn’t show the electron
