c2: the periodic table Flashcards
(18 cards)
how is the modern periodic table ordered
by atomic number
how were the early lists of elements numbered
by atomic mass
why did Mendeleev swap the order of some elements
to group them by their chemical properties
why did Mendeleev leave gaps in his periodic table
leave room for elements that had not yet been discovered
why do elements in a group have similar chemical properties
have the same number of chemical electrons in their outer shell
where are metals and non-metals located on the periodic table
metals: the left
non-metals: the right
what name is given to the group 1 elements
alkali metals
why are alkali metals named this
they are metals that react with water to form an alkali
give the general equations for the reactions of alkali metals with oxygen, chlorine and water
metal + oxygen = metal oxide
metal + chlorine = metal chloride
metal + water = metal hydroxide + hydrogen
how does the reactivity of the metals change down the group
increases - becomes more reactive
give the name of the group 7 elements
halogens
give the formula for the 4 first elements
(all 2s are little)
F2
Cl2
Br2
I2
how does the melting points of the halogens change down the group
increases - higher melting point
how does the reactivity of the halogens change down the group
decreases - less reactive
what is a displacement reaction
when a more reactive element takes the place of a less reactive one in a compound
what is the name given to group 0 elements
noble gases
why are noble gases inherent
they have full outer shells so do not need to lose or gain electrons
how do the melting points of the noble gases change down the group
increases - higher melting point
