Chemistry A2 Unit 2 Module 3
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Define transition metal
A d-block element that forms an ion with an incomplete d sub-shell.
Give 2 examples of d-block elements which are not transition metals. Why?
- Zn^2+ and Sc^3+.
- Sc only forms Sc^3+ where all d-orbitals are completely full
Which 2 d-block elements fill their electron orbitals weirdly?
Chromium and Copper.
Define Complex ion.
A transition metal ion bonded to one or more ligands by coordinate bonds (dative covalent bonds)
Define a ligand
A molecule or ion that can donate a pair of electrons with the transition metal ion to form a coordinate bond.
Define Coordination number.
The total number of coordinate bonds formed between a central metal ion and its ligands.
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