ionic bonding Flashcards
how are ions arranged in a compound
giant ionic lattice
what is the top number
mass number
what is the bottom number
atomic number
what the period (row) equate to
number of shells
what does the group (column) equate to
no. of electrons in outer shell
what is an ionic bond
the electrostatic attraction between oppositely charged ions
what is the charge of a non-metal ion
negative
what is the charge of a metal ion
positive
charge of ammonium ion (NH4)
1+
charge of hydroxide ion (OH)
1-
charge of nitrate ion (NO3)
1-
charge of sulphate ion (SO4)
2-
charge of carbonate ion (CO3)
2-
how to show an ionic bond
dot and cross diagram
why do ionic bonds have high melting points
- ionic bonds are very strong
- in a giant ionic lattice there are lots bonds
- requires lots of energy to break
why do ionic compounds only conduct electricity when molten
because ions can move freely
why are giant ionic structures brittle
- when hit, layers of ions slide over each other
- so ions with the same charge end up next to each other
- like charges repel
- structure breaks
