D BLOCK ELEMENTS Flashcards
Mention D-block elements of 4th period.
Sc, Ti, V, Cr, Mn,
Fe, Co, Ni,Cu,Zn
Do all transition elements solid metals?
yes
what are the 2 types d block elements based on their configuration?
- Transitional
- NOn-transitional
What are non transition d block metals?
metals that produce only ions with d10 configuration.
mention non transition metals
ion of it with its configuration valence
- Zn 2+ —->
3d 10
Is sc3+ a non-transition metal ?
NO
3d10 4s0
IS Cu a non tranitional metal?
NO , even cu+ —>3d10
cu2+ —> 3d9
therefore copper is a transition metal
Mention 2 transion metals.
- scandium
- copper
Mention a nontransition metal.
- Zinc
From Sc to Ni what happens to atomic radii?
decreases
Why the atomic radiud dec. from sc to ni?
Attraction between nuclei and electrons is greater repulsions among electrons
From Ni to Zn what happens to atomic radius?
Increases.
How cu and zn radii increases?
Paired electrons exert more repulsive forces
What are the natural occurences of Titanium?
- Ilmenite - FeTiO3
- Rutile- TiO2
3 Natural occurences of Ferrous.
- Siderite - FeCo3
- Haematite - Fe2O3
- Magnetite - Fe3O4
Natural occurences of copper.
Copper Pyrite
CuFeS2
Mention Oxides of Chromium in increasing order of oxdizing number , with acidity.
2 - CrO - WB
3 - Cr2o3 - Amphoteric
4 - CrO2 - WA
6 - CrO3 - A
Mention Oxides of Manganese in increasing order of oxdizing number , with acidity.
2 - MnO - Basic
3 - Mn2O3 - Weakly basic
4 - MnO2 - Amphoteric
6 - MnO3 - WEakly acidic
7 -Mn2O7 - Acidic
Electronegativity of Sc
1.3
Oxidation states of Sc
+3
Oxidation states of Ti
+3
+4
4th period eke 1st ionization wedi dblock elemnts walada? s block elements walada?
4th period eke thiyena D block elements wala 1st ionization energy wedi > s block elementswlt wada.
1.5 electronegativity 1k thiyenne monatada?
15 inne mn & thiraniyai
Mn , Ti
Cu ge electronegativity?
1.9
Reactivity wedi d block elementswalda ? K Ca walada?
K Ca wala
1.6 thun3 dena kauda?
V
Cr
Zn
1.8 thun3 dena kauda?
Fe
Co
Ni
+4 , +5 oxidation states thiyenne katada?
V45
Sc oxidation state
+3
Thun skaya
Ti oxidation state
+3
+4
Ti 3 4k kada
Cr oxidation state
+2
+3
+5
+6
Kara 2 3 , 5 6
Mn oxidation state
+2
+3
+4
+7
mn de thu 4da 7…
Fe ,Co ,Zn oxidation state
+2
+3
FeCoZinc 2,3
cupper oxidation state
+1
+2
mula danne thamba witharai
Ni oxidation state
+2
nikn 2k dunna
period eke left to right yaddi what happens to
nuclear charge
shielding effect
both increases (two counter effects)
electrons towards 4s2 increases
how first ionization varies in the 4th period of d block elements
first ionization energy slightly increases
s block ekata comparative boiling and melting point wedi sgeda dgeda ?
dge boiling and melting points wedi godaak.
most d block ions coloured,da colourless,da?
colourless ion 2.
majority coloured
sc & Zn - colourless
in acidic medium Dichromate and chromate reduce wenne katada?
Cr3+
Dichromate acidic medium ekka react kalama ,
1. H 2 S
2. So 2
3. Fe
4. conc HCl
katada convert (oxidize wenne)
- s
- so4 2-
- fe3+
- cl2 , cl-
Dichromate + __H2S + __H+
—->
__Cr3+ + __S + __H2O
Dichromate +3 H2S +8 H+
—->
2Cr3+ + 3S + H2O
Dichromate + __SO2 + __H+
—->
__Cr3+ + __sulphate ion + __H2O
Dichromate + 3 SO2 + 2H+
—->
2Cr3+ + 3 sulphate ion + H2O
Dichromate + __Ferrous ion + __H+
—->
__Cr3+ + __Ferric ion + __H2O
Dichromate + 6 Ferrous ion + 14 H+
—->
2 Cr3+ + 6 Ferric ion + 7 H2O
Dichromate + conc ___ HCl
—->
__Cr3+ +Cl2 ion + Cl- __H2O
Dichromate + __Ferrous ion + __H+
—->
__Cr3+ + __Ferric ion + __H2O
Dichromate + ___H+ + ___electrons
what will form
Cr3+ + ___H2o
