Transition Elements Flashcards
Fe 2+ with NaOH
Fe(OH)2
Pale green to dark green ppt
Fe 3+ with NaOH
Fe(OH)3
Pale yellow to brown ppt
Mn 2+ with NaOH
Mn(OH)2
Pink to pale brown ppt
Cu 2+ with NaOH
Cu(OH)2
Pale blue to blue ppt
Cr 3+ (aq) with excess NaOH (2 step)
Cr(OH)3
Cr(OH)6
Violet soloution to grey green ppt to dark green soloution
Cr3+ with excess NH3 (2 step)
Cr(OH)3
Cr(NH3)6
Violet soloution to grey green ppt to purple soloution
Cu2+ with excess NH3 (2 step)
Cu(OH)2
Cu(NH3)4(H2O)2
Pale blue soloution to blue ppt to dark blue soloution
Cu2+ with Cl ions
Cu(Cl)4
Pale blue soloution to yellow soloution
(Mixture is green)
Cr2+
Pale blue
KCr(SO4)2 dissolved in water
Cr(H20)6
Violet
What is a dblock element?
Highest energy electrons In d orbitals
List some properties of transition metals?
Metallic, high mp and no , shiny ,conductive
How and why do chromium and coppers electron configuration differ to other transition metals?
They don’t pair in the 4s orbital as having a half filled d5 sub shell or filled d10 sub shell increases the stability of the atoms
When is the 4s orbital filled and empties in d-block ions
Filled first, emptied first
Definition for transition metals
D block elements that form at least one ion with a partially filled d subshell
Why are Scandium and zinc not classified as transition metals
The only ions they form don’t have partially filled d sub shell
- Sc^3+
- Zn^2+
List 3 properties of transition metal compounds
- Form compounds in which transition metal has different oxidation states
- coloured compounds
- act as catalysts
What oxidation number can all the transition elements have ?
2+