Some Important fact about elements of periodic table.

1. Lowest electronegativity: Cs
2. Highest electronegativity: F
3. Highest ionisation potential: He
4. Lowest ionisation potential: Cs
5. Lowest electron affinity: Noble gases
6. Highest electron affinity: Chlorine
7. Least electropositive element: F
8. Lowest m. pt. metal: Hg
9. Highest m. pt. and b. pt. metal: W (Tungsten)
10. Lowest m. pt. and b. pt. non metal : He
11. Notorious element: Hydrogen
12. Lightest element: Hydrogen
13. Smallest atomic size : H
14. Largest atomic size: Cs
15. Largest anionic size: I–
16. Smallest cation: H+
17. Most electropositive element: Cs
18. Element with electronegativity
next to Fluorine : Oxygen
19. Group containing maximum no.
of gaseous elements in periodic table : Zero group
20. Total number of gaseous elements
in periodic table: 11 (H, N, O, F, Cl, He, Ne,Ar, Kr, Xe, Rn)
21. Total number of liquid elements in
periodic table: 6 (Ga, Br, Cs, Hg, Fr, Uub)
22. Smallest anion: F–
23. Liquid element of radioactive nature : Fr
24. Total number of radioactive elements in
periodic table: 25
25. Volatile d-block elements: Zn, Cd, Hg,Uub
26. Element containing no neutron : H
27. Most abundant element on earth : Oxygen
28. Rarest element on earth: At (astatine)
29. Most abundant metal on earth : Al
30. Element having maximum tendency
for catenation; C
31. Non metal having  . pt., b. pt. : Carbon (diamond)
32. Metals showing highest oxidation number: Os (+8)
33. Most electrovalent compound: CsF
34. Most stable carbonate: Cs2CO3
35. Strongest alkali: CsOH
36. Strongest basic oxide: Cs2O
37. Best electricity conductor among metals: Ag
38. Best electricity conductor among non metals: graphite
39. Most poisonous element: Pu(Plutonium)
40. Liquid non metals: Br
41. Element kept in water: Phosphorous
42. Elements kept in kerosene: IA group element (except Li)
43. Elements sublime on heating: I2
44. Noble metals: Au, Pt. etc.
45. Amphoteric metal: Be, Zn,Al, Sn, Pb
46. Amphoteric nonmetal: Si
47. Metalloids elements: B, Si,As, Te,At, Ge, Sb
48. Nonmetals having metallic lusture : Graphite, Iodine
49. Heaviest naturally occurring element: Uranium
50. Poorest conductor of electricity: Diamond
51. Hardest naturally occurring element: Diamond
52. Lightest solid metal: Li
53. Amphoteric oxides: BeO, Al₂O₃, ZnO, PbO, PbO₂, SnO, SnO₂,
Sb₂O₃, As₂O₃ etc.
54. Neutral oxides of nonmetals: NO, CO, H₂O, N₂O
55. Dry bleacher: H₂O₂
56. Dry ice: Solid CO₂
57. First man made element: Tc 43 (Technicium)
58. Smallest period: Ist (2 elements)
59. Largest period in periodic table: 6th (32 elements)
60. Largest group in periodic table: IIIB(32 elements)
61. Most abundant d-block metal: Fe
62. Most abundant s-block metal: Ca
63. Highest density (Metals) : Os, Ir
64. Highest density (Non Metals) : Boron
65. Most abundant gas in atmosphere: Nitrogen
66. Most abundant element in the universe: Hydrogen

Related Questions:

(1) What are the Amphoteric metals ? gives Examples.

(2) Name of total metalloids present in periodic table ?

(3) Total numbers of elements which are liquid at normal temperature is ?

(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.

(5) What is atomic density ? give the periodicity of atomic density in periods and groups.

(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?

(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.

(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?

(9) The electron affinity of sulphur is greater than oxygen. Why?

(10) The first ionization energy of carbon atom is greater than that of boron atom, whereas reverse is true for the second ionization energy. Explain.

(11) The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.

(12) Li2CO3 decomposes on heating but other alkali metal carbonates don’t. Explain.

(13) Of all noble metals, gold has got a relatively high electron affinity. Explain.

(14) Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?

(15) What are the increasing order of ioni radii of first group elements in water ?

(16) What are the increasing order of molar conductivity of first group elements in water ?