Zinc Element Facts


Zinc

Batteries - the outside of these batteries is made of zinc - zinc acts as both battery electrode and container

30
Zn
65.41

Data Zone

Classification: Zinc is a transition metal
Color: bluish silver
Atomic weight: 65.41
State: solid
Melting point: 419.53 oC, 692.68 K
Boiling point: 910 oC, 1183 K
Electrons: 30
Protons: 30
Neutrons in most abundant isotope: 34
Electron shells: 2,8,18,2
Electron configuration: [Ar] 3d10 4s2
Density @ 20oC: 7.14 g/cm3
Show more: Heats, Energies, Oxidation, Reactions, Compounds, Radii, Conductivities
Atomic volume: 9.2 cm3/mol
Structure: hcp: hexagonal close packed
Hardness: 2.5 mohs
Specific heat capacity 0.39 J g-1 K-1
Heat of fusion 7.322 kJ mol-1
Heat of atomization 131 kJ mol-1
Heat of vaporization 115.30 kJ mol-1
1st ionization energy 906.4 kJ mol-1>
2nd ionization energy 1733.2 kJ mol-1
3rd ionization energy 3832.6 kJ mol-1
Electron affinity
Minimum oxidation number 0
Min. common oxidation no. 0
Maximum oxidation number 2
Max. common oxidation no. 2
Electronegativity (Pauling Scale) 1.65
Polarizability volume 6.4 Å3
Reaction with air vigorous, ⇒ ZnO
Reaction with 15 M HNO3 vigorous, ⇒ Zn(NO3)2, NOx
Reaction with 6 M HCl mild, ⇒ H2, ZnCl2
Reaction with 6 M NaOH mild, ⇒ [Zn(OH4)]2-, H2
Oxide(s) ZnO, ZnO2 (zinc peroxide)
Hydride(s) ZnH2
Chloride(s) ZnCl2
Atomic radius 135 pm
Ionic radius (1+ ion)
Ionic radius (2+ ion) 88 pm
Ionic radius (3+ ion)
Ionic radius (1- ion)
Ionic radius (2- ion)
Ionic radius (3- ion)
Thermal conductivity 116 W m-1 K-1
Electrical conductivity 16.9 x 106 S m-1
Freezing/Melting point: 419.53 oC, 692.68 K



Discovery of Zinc

Zinc ores have been used to make brass (a mixture of copper and zinc) and other alloys since ancient times.

A zinc alloy comprising 87.5% zinc was discovered in an ancient site in Transylvania.

Zinc smelting began in the 12th century in India by reducing calamine (zinc carbonate, ZnCO3) with wool and other organic materials.

The element name is reported to come from the old German word ‘zinke’ meaning pointed; a reference to the sharp pointed crystals formed after smelting.

Credit for isolating the metal is usually given to Andreas Marggraf in 1746, in Berlin. He heated a mixture of calamine ore and carbon in a closed vessel without copper to produce the metal.

Zinc reacts very vigorously with sulfur. Here’s a test firing of a sulfur/zinc rocket.

Reaction of zinc with iodine.

Appearance and Characteristics

Harmful effects:

Zinc is not considered to be particularly toxic.

Zinc is essential for good health, but excess zinc is toxic and can cause nausea.

Characteristics:

Zinc is a bluish-silver, lustrous metal that tarnishes in moist air, producing a layer of carbonate. It is somewhat brittle at room temperature but malleable above 100 oC.

Zinc reacts with both acids and alkalis.

It is a fair conductor of electricity, and burns in air with a bright bluish-green flame producing white clouds of the oxide.

Uses of Zinc

Zinc is used to galvanize iron to inhibit corrosion.

Zinc forms many alloys with other metals such as brass, German silver, nickel silver, typewriter metal and solders. Zinc alloys are used in die-castings for the car industry.

The metal acts as both the container and as an electrode in zinc-carbon batteries. The drawback of this dual use is that the electrode is consumed when the battery is in use, getting thinner until eventually the battery starts leaking.

Zinc is an essential trace element for animals and plants.

Zinc oxide, a white powder, is a versatile compound that has many uses.

It is used in sun block, make-up and in ointments such as calamine lotion.

It is also used in the rubber industry, concrete manufacturing and in paints.

Abundance and Isotopes

Abundance earth’s crust: 70 parts per million by weight, 22 parts per million by moles

Abundance solar system: 2 part per million by weight, 30 parts per billion by moles

Cost, pure: $5.30 per 100g

Cost, bulk: $0.18 per 100g

Source: Zinc is found in nature combined with other elements as ores. The main ores of zinc are sphalerite (sulfide), smithsonite (carbonate), hemimorphite (silicate), and franklinite (zinc, manganese, iron oxide).

Commercially, zinc is obtained from zinc sulfide minerals. The minerals are concentrated and then usually roasted to oxidize the zinc sulfide to zinc oxide. Zinc is then extracted by either large-scale electroplating (electrowinning) or by pyrometallurgy, where processing reduces zinc oxide with carbon or carbon monoxide at 950 oC into the metal.

Isotopes: Zinc has 25 isotopes whose half-lives are known, with mass numbers 57 to 83. Naturally occurring zinc is a mixture of five isotopes and they are found in the percentages shown: 64Zn (48.6%), 66Zn (27.9%), 67Zn (4.1%), 68Zn (18.8%) and 70Zn (0.6%). Over 48.6% of naturally occurring zinc is in the form of 64Zn.

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Comments

  1. i loved this site it helped me for a project in school.