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ChemWiki: The Dynamic Chemistry E-textbook > Inorganic Chemistry > Descriptive Chemistry > p-Block Elements > Group 14: The Carbon Family > Chemistry of Tin

Chemistry of Tin

Tin, an element in Group 14 (The Carbon Family) of the periodic table, has mainly metallic properties. Tin has atomic number 50 and an atomic mass of 118.710 atomic mass units. Tin, or Sn (from the Latin name Stannum) has been known since ancient times, although it could only be obtained by extraction from its ore. Tin shares chemical similarities with germanium and lead. Tin mining began in Australia in 1872 and today Tin is used extensively in industry and commerce. 

Introduction

Basic Properties of Tin

 color  white with blueish tinge
 hardness  softer than gold, harder than lead
 atomic radius  140 pm
 density

 5.77g/cm3

 melting point  232 degrees Celsius 
 boiling point  2623 degrees Celsius
 electrical conductivity  about 1/7th that of silver
 electrode potential  >0.192V
 first ionization energy  709 kJ/mol
 Ionic Radius  93 pm

Basic Reactions of Tin with Certain Elements

 

  

Hydrogen Tin not affected
Nitrogen Tin absorbs it instead of hydrogen in electric discharge
Oxygen When heated in it, Tin produces stannic oxide
Argon No sign of a combination of Tin with Argon
Fluorine Does not react with Tin at low temperatures, but at 100 degrees Celsius they form stannic fluoride
Chlorine Acts on Tin at room temperature
Bromine Acts on tin at room temperature
Sulfur Unites directly with Tin when heated
Selenium  Reacts vigorously with Tin
Tellurium Reacts vigorously with Tin
Nitrogen Forms on compound by direct union with Tin
Arsenic  Reacts with tin under heat and light
Antimony Is dissolved by molten Tin
 

Reactions

1. Reaction with oxygen

Sn(s) + O2(g) → SnO2(s)

2. Reaction with water (steam)

Sn(s) + 2H2O(g) → SnO2(s) + 2H2(g)

Isotopes

There are 10 known stable isotopes of Tin, the most of any elements on the periodic table. This high number of stable isotopes could be attributed to the fact that the atomic number of Tin (50) is a 'magic number' in nuclear physics.

Isotope % Natural Abundance
112 amu 0.95%
116 amu 14.24%
117 amu 7.57%
118 amu 24.01%
119 amu 8.58%
120 amu 32.97%
122 amu 4.71%
124 amu 5.98%
 

Allotropes of Tin.

Tin has 3 allotropes: alpha, beta and gamma tin. Alpha tin is the most unstable form of tin. Beta tin is the most commonly found allotrope of tin and gamma tin only exists at very high temperatures.

Oxidation States of Tin

Tin, although it is found in Group 14 of the periodic table, is consistent with the trend found in Group 13 where the lower oxidation state is favored farther down a group. Tin can exist in two oxidation states, +2 and +4, but Tin displays a tendency to exist in the +4 oxidation state.

Common Compounds of Tin

Tin forms two main oxides, SnO and SnO2 (amphoteric).  

Electron Configuration of Tin

 

Tin has a ground state electron configuration of 1s22s22p63s23p64s23d104p65s24d105pand can form covalent tin (II) compounds with its two unpaired p-electrons. In the three dimensional figure below, the first and most inner electron shell is represented by blue electrons, the second electron shell made up of eight electrons is represented by red electrons, the third shell containing eighteen electrons is represented with green electrons, and the next outer electron again contains eighteen electrons and represented in purple.

Uses of Tin

Nearly half of the tin metal produced is used in solders, which are low melting point alloys used to join wires. Solders are important in electrician work and plumbing. Tin is also used as a coating for lead, zinc, and steel to prevent corrosion. Tin cans are widely used for storing foods; the first tin can was used in London in 1812.

Questions

Find the oxidation state of tin in the following compounds:

a. SnCl^2       answer:2

b. SnO^2        answer:4

Write an equation for the reaction of tin with water. Under what conditions does this reaction take place?

answer: Sn(s) + 2H2O(g) → SnO2(s) + 2H2(g)   Reaction takes place if water is heated to a high temperature to form steam.

Which of these reactions take place.

a. tin with oxygen               ANSWER: YES

b. tin with hydrogen            ANSWER: NO

c. tin with argon                  ANSWER: NO

d. tin with chlorine              ANSWER: YES

Arrange the following in order of increasing atomic radius: Sn, K, Ag, C, Pb

ANSWER: C<Sn<Pb<Ag<K

Arrange the following in order of decreasing ionization energy: Sn, Si, Pb, I, In.

ANSWER: Si> I > Sn > In > Pb

References

  1. Harwood, William S.; Herring, F. Geoffrey; Madura, Jeffry D.; and Petrucci, Ralph H. General Chemistry: Principles and Modern Applications. Pearson Education, Inc: New Jersey, 2007. 
  2. Bailar, J.C.; Emeleus, H.J.; Nyholm, Sir Ronald; Trotman-Dickenson, A.F. Comprehensive Inorganic Chemistry. Pergamon Press: Oxford, 1973. 
  3. Hampel, Clifford A.; Jacobson, C.A. Encyclopedia of Chemical Reactions. Reinhold Publishing Corporation: New York, 1958. 
  4. Mellor, J.W. A Comprehensive Treatise on Inorganic and Theoretical Chemistry. Longmans, Green and Co.: New York, 1927. 

Outside Links

  • Wikipedia.com

Contributors

  • Taylor Hughes, University of California Santa Barbara 

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Last Modified
18:20, 1 Oct 2013

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