periodic table Flashcards
what 2 main categories are the periodic table divided into?
metals and non metals
describes some properties of metals
solid ( except mercury ) strong high melting point conducts electricity well ductile
what does ductile mean?
can be stretched into shapes
describe some properties of non metals
low melting point
not as strong
doesnt conduct electricity well
what is the periodic table arranged into?
groups and periods
what is the column going down on the periodic table called?
group
what is the column going across on the periodic table called?
period
what are the 4 main groups on the periodic table
group 1- alkali metals
transition metals
group 8/0- noble gases
group 7 halogens
what is an element?
a substance made from only one type of atom
how many elements are in the periodic table
118
what is a compound
made up of 2 or more DIFFERENT atoms CHEMICALLY joined
what is a mixture
two or more substances physically mixed
what can passing electricty through a compound do?
break it down into it elements
separate those elements
what is the process of breaking down elements called
electrolysis
what materials are electrodes made from
graphite
what is the difference between a compound and mixture
compound not easy to separate
compound is chemically joined
what does the name of a compound tell us
what elements are within the compound
what does the first part of the name of the compound tell us
the first element
what does the 2nd part of the name of the compound tell us
the 2nd element
what does the 3rd part of the name of the compound tell us
if a 3rd element is present
what does ‘ide’ in the 3rd part of the name of the compound tell us
that only 2 elements are present
what does ‘ate’ or ‘ite’ in the 3rd part of the name of the compound tell us?
that oxygen is also present in the compound
which elements are always found in oxides
oxygen
which elements are alwyas found in suphates
oxygen and sulphur
