1. Valence electrons of the lanthanide series
2. Ionic radius of the series
3. The density of the series
4. Nuclear mass of the series
Ionic radius of the series
1. Fe
2. V
3. Cu
4. Ag
Ag
1. Ce4+
2. Sm2+
3. Lu3+
4. Gd3+
Ce4+
1. Bi, Pb, Cu
2. Cu, Ni, Pb
3. Bi, Pb, Sn
4. Fe, Cu, Au
Bi, Pb, Sn
1. Lead forms lead oxide with water
2. Water containing dissolved air attacks lead
3. They are slowly covered with lead carbonate
4. They are corroded by air
Water containing dissolved air attacks lead
1. Al(OH)3
2. Fe(OH)3
3. Cr(OH)3
4. Cu(OH)3
Cu(OH)3
1. +5
2. +6
3. +7
4. +8
+7
1. Blue
2. Green
3. White
4. Bluish - green
White
1. Ti3+
2. V3+
3. Cu3+
4. Sc3+
Sc3+
1. H2SO4
2. H3PO4
3. HCl
4. HNO3
HNO3