Benutzer
-one or more new chemicals are formed -energy is taken in or out during the reaction -the change is difficult to reverse
atoms bond with eachother in order to contain a full outer shell of electrons
positive ions
negative ions
a strong electrostatic attractions between ions of opposite charge
a metal atom loses an electron to a non-metal atom -this forms a positive metal ion and negative non-metal ion - they form a lattice -the compound has no overall charge
elements from group 4 and 5 -noble gases
the names of ions go together with the cation first
-write name for the ionic compounds -write down the symbols -the compound must have no overall charge
two atoms share electrons leading to full outer shells
an element containing molecules with two or more molecules
-held in tight lattice -lattice in each direction giving crystals -strong forces
-weak forces in lattice -grow in all directions giving crystals -weak forces
-high melting point -usually water soluble -conduct electricity when melted or dissolved in water
low melting points -tend to be insoluble -do not conduct electricity
atoms are tightly packed together causing electrons to separate from them resulting in lattice of positive ions in a sea of electrons
electrostatic attraction between positive ions and delocalised electrons
high melting points -conductors of heat and electricity