- Melting point= Li > Na > K > Rb > Cs
2. Colour of the flame= Li-Red, Na-Golden, K-Violet, Rb-Red, Cs-Blue, Ca-Brick red, Sr-Blood red, Ba-Apple green
3. Stability of hydrides = LiH > NaH > KH > RbH> CsH
4. Basic nature of hydroxides= LIOH < NaOH < KOH < RbOH < CsOH
5. Hydration energy= Li> Na > K> Rb > Cs
6. Reducing character= Li > Cs > Rb > K > Na
7. Stability of +3 oxidation state= B> Al > Ga > In > T1
8. Stability of +1 oxidation state= Ga < In < TI
9. Basic nature of the oxides and hydroxides= B< Al< Ga < In < TI
10. Relative strength of Lewis acid= BF3 < BCl3 < BBr3 < BI3
11. Ionisation energy= B>Al<Ga >In < TI
12. Reactivity= C<Si< Ge < Sn <Pb
13. Metallic character= C< Si < Ge < Sn < Pb
14. Acidic character of the oxides= Co2 > SiO2 > Ge02 > SnO2 > PbO2
15. Reducing nature of hydrides= CH4 < SiH4 < GeH4 < SnH4 < PbH4
16. Thermal stability of tetrahalides= CCl4> SiCl4> GeCl4> SnCl4 > PbCl4
17. Oxidising character of M+4 species= GeCl4 < SnCl4 < PbCl4
18. Ease of hydrolysis of tetrahalides= SiCl4 < GeCl4 < SnCl4 < PbCI4
19. Acidic strength of trioxides= N203 > P2O3 > As2O3
20. Acidic strength of pentoxides= N2O2 > P2O2> As202 > Sb2O2 > Bi̟202
21. Acidic strength of oxides of nitrogen= N2O < NO <N2O3 <N2O4 < N2O5
22. Basic nature/ bond angle/ thermal stability and dipole moment of hydrides= NH3 > PH3 > AsH3 > SbH3 > BiH3
23. Stability of trihalides of nitrogen= NF3 > NCl3 > NBr3
24. Lewis base strength= NF3 <NCl3 <NBr3 < NI3
25. Ease of hydrolysis of trichlorides= NCl3 > PCI3 > AsCl3 > SbCl3 > BiCl3
26. Lewis acid strength of trihalides of P, As, and Sb= PCl3 > ASCl3 > SbCl3
27. Lewis acid strength among phosphorus trihalides PF3 > PCl3 > PBr3 > PI3
28. Melting and boiling point of hydrides= H2O > H2Te > H2Se >H2S
29. Volatility of hydrides= H2O < H2Te < H2Se < H2S
30. Reducing nature of hydrides= H2S < H2Se < H2Te
31. Covalent character of hydrides= H2O < H2S < H2Se < H2Te
32. The acidic character of oxides (elements in the same oxidation state)= SO2 > SeO2 > TeO2 > PoO2 SO3 > SeO3 > TeO3
33. Acidic character of oxide of a particular element (e.g. S)= SO < SO2 < SO3 SO2 > TeO2 > SeO2 > PoO2
34. Bond energy of halogens= Cl2 > Br2 > F2 > I2
35. Solubility of halogen in water = F2 > Cl2 > Br2 > I2
36. Oxidising power= F2 > Cl2 > Br2 > I2
37. Enthalpy of hydration of X ion= F- > Cl- > Br- >I-
38. Reactivity of halogens:= F> Cl> Br > I
39. Ionic character of M-X bond in halides= M-F > M-Cl > MBr > M-I
40. Reducing character of X ion:= I- > Br- > Cl- > F-
41. Acidic strength of halogen acids= HI > HBr > HCI > HF
42. Reducing property of hydrogen halides= HF < HCL < HBr < HI
43. Oxidising power of oxides of chlorine= Cl2O > ClO2 > Cl206 > Cl2O7
44. Decreasing ionic size= 02- > F- > Na+ > Mg2+
45. Increasing acidic property= Na2O3 < MgO < ZnO< P205
46. Increasing bond length= N2 <02 < F2 < CL2
47. Increasing size= Ca2+ < Cl- < S2-
48. Increasing acid strength= HClO < HClO2 < HClO3 < HClO4
49. Increasing oxidation number of iodine= HI< I2 <ICl <HIO4
50. Increasing thermal stability= HOCl < HOClO < HOClO2 < HOClO3