properties Flashcards
1
Q
define transition element
A
d-block element which forms one or more stable ions with an incomplete d subshell
2
Q
why is Sc a d block element but not a transition element?
A
Sc = 1s2 2s2 2p6 3s2 3p6 4s2 3d1
Sc2+= 1s2 2s2 2p6 3s3 3p6 - has an empty d subshell
3
Q
why is Zn a d block element but not a transition element?
A
Zn= 1s2 2s2 2p6 3s2 3p6 4s2 3d10
Zn2+= 1s2 2s2 2p6 3s2 3p6 4s0 3d10
4
Q
what are the physical properties of transition metals?
A
- giant metallic lattice
- high density
- shiny
- high mp + bp
- conductors
5
Q
what do transition metals have?
A
variable oxidiation states
6
Q
what do transition metals form due to partially filled d orbitals?
A
coloured ions
7
Q
why are transition metals good catalysts?
A
- provide a surface for reaction to take place (reactants are adsorbed onto metal)
- change oxidation states so can form intermediates with reactants lowering activation energy
