THE TRANSITION METALS. Transition means “an in between state” and the transition elements come in between Group 2 and Group 3. Gp 2. Gp 3. H. He. Li. Be. B. C. N. O. F. Ne. Na. Mg. Al. Si. P. S. Cl. Ar. K. Ca. Sc. Ti. V. Cr. Mn. Fe. Co. Ni. Cu. Zn. Ga. Ge.
Transition means “an in between state” and the transition elements come in between Group 2 and Group 3.
?The Transition elements
They are less reactive
than Group 1 or
Group 2 metals.
They mostly form
are often referred to
as ‘typical’ metals.General Characteristics
Similarities are more noticeable than differences although there are still some broad patterns.
They are all dense which is what we expect of metals.
ZnProperties – density
Melting points show no regular pattern – other than nearly all being high which is typical of metals.
(Note zinc doesn’t fit very well on either density or melting point.)
ZnProperties – melting point
Again it is similarities that stand out rather than differences: they tend to react relatively slowly (e.g.) with air, water and acid.
The general trend is to reduced activity across the Periodic Table but again the trend is far from perfect with zinc in particular being more reactive than you might expect.
ZnProperties – reactivity
Rusting: a slow but costly process!
General reduced reactivity
A catalyst is a substance that speeds up a chemical reaction without being used up.
Catalysts are hugely valuable in industry where they can save time and energy.
Many transition elements ( and their compounds) are catalysts.
Used in plastic manufacture
Used in oil hydrogenationProperties – catalysis
The three most commonly known transition elements are iron or steel, copper and zinc.
iron or steel
Electrical and plumbing work
General engineering metal
Galvanising steel to protect itUses
Pair the metal up with its uses or steel, copper and zinc.
iron or steel
Pair the metal catalyst with the substance. or steel, copper and zinc.
They are non-metals.
They are light (low density).
They are strong.
They are non-conductors.
Which of these does copper words.NOT tend to be
Ornaments and jewellery
Transition elements can speed up other reactions without getting used up in the process.
What do we call substances that do this?
Transition elements often form coloured compounds. getting used up in the process.
What colour compound does copper usually form?
How would you describe the reactivity of transition elements within the Periodic Table?
Always more reactive across periods (left to right).
Generally less reactive across periods (left to right).
No change in reactivity.
Changes but no trends in reactivity.