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Sunday, June 14, 2020

Name of total metalloids present in periodic table ?

Metalloids elements: B, Si, Ge, As, Sb, Te, Po, At, 

Mnemonic: Baba (B), Singh (Si), Gee (Ge), Asali (As), Sabun (Sb), Tel (Te), Potkar (Po) kar aate (At) hai.

     " Baba Singh Gee Asali Sabun Tel Potakar aAte hai"

Related Questions:

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

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

(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 ?



What are the Amphoteric metals ? gives Examples.

Amphoteric metals are those metals which oxides behave as acid with bases as well as behave as base with acids

Amphoteric metal: Al, Be, Zn, Sn, Pb

Mnemonic: Ali (Al) Be (Be) ke Zane (Zn) se Sanna (Sn) hui pagal (Pb):

                     "Ali be ke Jane se Sanna hui pagal"

Related Questions:

(1) Effective Nuclear charge (Z* or Zeff): Slater's rule: Screening effect or Shielding effect

(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 ?


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 ?


Write the Lewis structures of N2O, NO2 and N2O5 :


Why Ga has small size than Al exceptionally ?

When we move down to Ga from Al we see that 3d shell fills before Ga and due to increase in effective nuclear change size of Ga in smaller than aluminium.
 

Related Questions:

Why Ga has small size than Al exceptionally

Why aqueous solution of borax reacts with two moles of acids ?

What is structure of solid Ortho Boric acid ?

What is the structure of trimetaboric acid and trimetaborate ion?  

Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?

Why Borazine (B3N3H6) is also known as inorganic benzene ?.

Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.

Why B-F do not exist as dimer?. Explain.

Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?

Four-center two-electron bond (4C-2e Bond): Structure of AlCl3:

What is the molecular formula of Borax ?

What is the difference between the structure of AlCl3 and diborane?

Titration of Borax: Tincal : Suhaga :

Structure of Borax: Tincal or Suhaga:

Titration of Boric Acid:

DIBORANE-HYDRIDE OF BORONE-(B2H6):

CHEMICAL PROPERTIES OF DIBORANE:

STRUCTURE OF BORON NITRIDE:

STRUCTURE OF BORAZINE OR BORAZOLE:

STRUCTURE OF DIBORANE :

BORIC ACID (H3BO3) :

BORAX BEAD TEST: