Chapter 24 - Transition Elements Flashcards
D-block element, The formation and shapes of complex ions, Stereoisomerism in complex ions, Ligand substitution and precipitation, Redox and qualitative analysis.
What are the two irregularities in the d-block in terms of electron configuration?
Chromium: 3d5 4s1 instead of 3d4 4s2
Copper: 3d10 4s1 instead of 3d9 4s2
Why do these irregularities exist in the d block electron configurations?
A half filled and a fully filled d sub shell gives greater stability to these atoms.
What are transition elements?
D-block elements that form at least one ion with a partially filled d-orbital.
Which d-block elements are excluded from being transition elements?
Scandium and zinc
What are the properties of the transition elements?
Form compounds in which the transition element has different oxidation states
Form coloured compounds
Elements and compounds can act as catalysts
What colours are the various ions of Chromium?
+3 green
+6 orange
What colours are the various ions of Copper?
+2 blue
What colour is potassium dichromate(VI)?
Orange
What colour is cobalt(II) chloride?
Pink-purple
What colour is nickel(II) sulfate?
Green
What colour is hydrated copper(II) sulfate?
Blue
What is the catalyst used in the Haber process?
Iron
What is the catalyst used in the Contact process?
Vanadium(V) oxide
V2O5
What is the catalyst used in hydrogenation?
Nickel
What is the catalyst used in catalytic decomposition of hydrogen peroxide?
Manganese(IV) oxide
MnO2
Define what a complex ion is
A transition metal ion bonded to ligands by coordinate bonds.
Define coordination number
The number of coordinate bonds attached to the central metal ion.
Define what a ligand is
A molecule or ion that can donate a pair of electrons to the transition metal ion to form a coordinate bond.