Transition Metals
Transition metals have variable charges and coloured compounds.
About this topic
The transition metals occupy the central block (groups 3–12). They are hard, dense, strong, have high melting points and conduct well. Unlike main-group metals, they form ions with several charges (iron as Fe2+ and Fe3+), make coloured compounds, and are widely used as catalysts.
Their behaviour arises because the 4s and 3d electrons have similar energies, so different numbers of electrons can be lost. Partly filled d orbitals absorb certain colours of visible light and so give compounds colour: copper(II) sulfate solution is blue, iron(III) is yellow-brown and potassium permanganate is purple. Roman numerals in names show the charge, as in iron(II) oxide. They also form complex ions with ligands.
Iron is the backbone of steel, copper wires carry electricity, titanium makes strong light implants and aircraft parts, and platinum in catalytic converters cleans exhaust gas. Vanadium oxide speeds up sulfuric acid manufacture and iron is the catalyst in the Haber process. Haemoglobin contains iron, and vitamin B12 contains cobalt.
Misconceptions: all transition metals are hard (mercury is a liquid, and gold is soft); and that they always lose 4s electrons last. In fact 4s electrons are lost first when ions form. Zinc is sometimes excluded because it only forms Zn2+.
Key ideas
- d-block elements
- Good catalysts
- Form complex ions
Quick check
Use cases: where Transition Metals helps
- Homework: review the key idea behind Transition Metals before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Transition Metals without notes.
- Visual learning: play with the interactive lab to see how Transition Metals changes when you adjust its inputs.
- Teaching a friend: explain Transition Metals in your own words, then compare your version with the key ideas.
Chemistry explains medicine, food, cleaning products, fuels and building materials.
Frequently asked questions
What is Transition Metals?
Transition metals have variable charges and coloured compounds.
What will I learn in Transition Metals?
d-block elements. Good catalysts. Form complex ions.
Is Transition Metals part of Chemistry?
Yes. It is one of 150 Chemistry topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Transition Metals lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Transition Metals?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.