How are elements arranged in the periodic table?
In order of atomic number, in groups and periods
Metals (conductivity, oxide form, placement)
Non-metals (conductivity, oxide form, placement)
What does the reactivity of an atom depend upon?
The number of electrons there are in the outer shell
What do elements in the same group have?
The same number of valence electrons, therefore react in similar ways
Why are noble gases unreactive?
Their outer shell is full so there is no need to gain or lose electrons in reactions