The Periodic Table Flashcards
Name for group 0 elements
Noble Gases
How do melting points of noble gases change DOWN the group
Increase
why are noble gases inert (unreactive)
they have full outer shells of electrons
what is displacement reaction
a more reactive element takes the place of a less reactive one
how do melting points change down group 7
Increase
Formulae for first 4 halogens
F2, Cl2, Br2, I2
Name for group 7 elements
Halogens
why does the reactivity of alkali metals increase down the group
they are larger atoms, so the outermost electron is further from the nucleus, meaning there are weak intermolecular forces, so easier to lose electrons
give general equations for reactions of alkali metals with oxygen, chlorine and water
-Metal + oxygen -> metal oxide
-Metal + chlorine -> metal chlorine
-Metal + water -> metal hydroxide + hydrogen
why are alkali metals named this
they are metals that react with water to form an alkali
Name for group 1 elements
Alkali metals
why do elements in a group have similar chemical properties
same number of electrons in outer shells
why did mendeleev leave gap in his periodic table
for undiscovered elements
why did mendeleev swap order of some elements
to group them by their chemical properties
how are early lists of elements ordered
by atomic mass
