How to find out valency of scandium
Answers
Answer:
3
Explanation:
scandium is third group element
Answer:
3
Explanation:
Sc = 21
1s2. 2s2 2p6,3s2 ,3p6 3d1, 4s2
now Scandium can lose 3 electrons [ maximum] so its maximum valency
may be 3 [ valency has no sign , it is Oxidation number which has sign +ve or - ve ]
TRANSITION ELEMENTS HAS VARIABLE VALENCY TO d orbital
e. g. Ti 22= 1s2,2s2,2p6,3s2,3p6,3d2,4s2 [ maximum four]
V 23= --------- Ar------------3d3,4s2 [ maximum five ]
Cr 24 = 1s2,2s2,2p6,3s2,3p6,3d5,4s1 [ see 3d5 half filled stable so chromium
has O.N. +1 to +6 ][ as in K2Cr2O7 , O.N. of Cr = +6]
Mn25= ----- Ar------3d5, 4s2 [ O.N. +1 to +7 ][ in MnO4-1 O.N.of Mn = +7]
Fe 26 = ----Ar--------3d6,4s2 [ it may lose 2e- & 3e-to get sstable configuration SO valency 2 & 3]
Co 27= ---Ar--------3d7,4s2
Ni 28 =-----Ar ----3d8, 4s2
Cu29= ----Ar - 3d10 ,4s1 [ see 3 d10 stableconfigurationn due to full filled orbital so has 1& 2 valency]
Zn 30 = --Ar 3d10 ,4s2 [ no variable valency ]