Copper Mass Number

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Learning Objectives

Copper, isotope of mass 64 Please visit the Copper element page for information specific to the chemical element of the periodic table. AWG Copper Wire Table Size and Data Chart @ 100 Degrees F. The American Wire Gauge (AWG) measurement system was designed with a purpose: for every three steps in the gauge scale, wire area (and weight per unit length) approximately doubles. This is a handy rule to remember when making rough wire size estimations!

  • Define mass ratio.
  • Calculate the mass ratio of an element in two different compounds.

Copper, isotope of mass 64 Please visit the Copper element page for information specific to the chemical element of the periodic table. Atomic Mass of Copper Atomic mass of Copper is 63.546 u. The mass number of copper is 63. When a specific isotope is not identified, simply listing the name of the element refers to the most abundant isotope. See full answer below. Become a member.

What are the similarities and differences between these two equations?

One of the fundamental laws of chemistry deals with the fact that we cannot (using chemical means) create or destroy matter. When a reaction is run, the number of atoms of each specific type must be the same on both sides of the equation. For some materials, it turns out that one element can combine with a second element in more than one ratio. Carrying out mass ratio calculations helped establish the law of multiple proportions.

Mass Ratio Calculations


Copper reacts with chlorine to form two compounds. Compound A consists of 4.08 g of copper for every 2.28 g of chlorine. Compound B consists of 7.53 g of copper for every 8.40 g of chlorine. What is the lowest whole number mass ratio of copper that combines with a given mass of chlorine?

Step 1: List the known quantities and plan the problem.

Copper 65 Mass Number


  • Compound A = 4.08 g Cu and 2.28 g Cl
  • Compound B = 7.53 g Cu and 8.40 g Cl

Apply the law of multiple proportions to the two compounds. For each compound, find the grams of copper that combine with 1.00 g of chlorine by dividing the mass of copper by the mass of chlorine. Then find the ratio of the masses of copper in the two compounds by dividing the larger value by the smaller value.

Step 2: Calculate

Compound A: [latex]displaystylefrac{4.08text{ g Cu}}{2.28text{ g Cl}}=frac{1.79text{ g Cu}}{1.00text{ g Cl}}[/latex]

Compound B: [latex]displaystylefrac{7.53text{ g Cu}}{8.40text{ g Cl}}=frac{0.896text{ g Cu}}{1.00text{ g Cl}}[/latex]

Compare the masses of copper per gram of chlorine in the two samples.

[latex]displaystylefrac{1.79text{ g Cu (in compound A)}}{0.896text{ g Cu (in compound B)}}=frac{2.00}{1}=2:1[/latex]

Copper Mass Number

The mass ratio of copper per gram of chlorine in the two compounds is 2:1.

Step 3: Think about your result.

Copper 64 Mass Number

The ratio is a small whole-number ratio. For a given mass of chlorine, compound A contains twice the mass of copper as does compound B.


  • The mass ratio gives the mass of an element that is found in combination with another element.


Use the link below to answer the following questions:

  1. What is the mass ratio?
  2. What is the hydrogen:water mass ratio?
  3. How many molecules of water per molecule of oxygen?


  1. What does the mass ratio tell us?
  2. In the compound CH4, what is the carbon:hydrogen mass ratio?
  3. Methane is CH4 and ethane is C2H6. What is the mass ratio of carbon per gram of hydrogen in the two compounds?
Show References


  1. Laura Guerin. CK-12 Foundation.
  2. User:Chemicalinterest/Wikimedia Commons. Public Domain.

Copper is relative inexpensive metal and widely used since old civilization. It is an excellent conductor of heat and electricity. Copper resist corrosion and is widely used in making various alloys.

Discovery and History

Copper has been known from prehistoric times and Neolithic humans used copper as stones as early as 8000 BCE. Copper was the first metal that was smelted from ores in 5000 BC and later used in pottery in North Africa. Early societies used it in place of gold and silver for making decorative items and ornaments [1]. Later, bronze which is an alloy of copper and tin was introduced between 3500 to 2500 BC in West Asia and Europe. In the Temple of King Sa’H-Re in Abusir, copper tubes for conveying water were used in 2750 BC. The name copper has been originated from Cyprium, which is Latin for metal of Cyprus. The term copper was introduced for the first time in 1530. The symbol of copper is Cu, derived from cuprum.


Periodic Table ClassificationGroup 11
Period 4
State at 20CSolid
ColorRed-orange metallic luster
Electron Configuration[Ar] 3d10 4s1
Electron Number29
Proton Number29
Electron Shell2, 8, 18, 1
Density8.96 at 20°C
Atomic number29
Atomic Mass63.55 g.mol -1
Electronegativity according to Pauling1.90


Copper is widely present in many parts of world in combined state and free state. In combined form it exit as chalcocite (sulfide mineral), chalcopyrite (copper +iron sulfide), bornite (copper+ iron ore), cuprite (oxide mineral), malachite (copper carbonate) and azurite (copper carbonate) [2]. It is also present in the ashes of sea weeds and in sea corals. Copper is also present in human liver. In invertebrates it is present in many mollusks and arthropods. Andes Mountains in Chile is the greatest known deposit of copper mineral. Other major producers are Peru, China and the United States. Commercially copper is produced through smelting, followed by electrodeposition from sulfate solutions.

Physical characteristics

Fresh Copper has pinkish color but soon convert into reddish orange color due to direct exposure with oxygen. Copper oxidizes in the air and exhibit green color that’s why roof of building looks green. Copper is flexible and soft due to which it can be stretched into wires easily [3]. Copper dissolve in a mixture of hydrogen peroxide and hydrochloric acid to form copper chloride. Copper’s atomic number is 29 and its atomic mass is 63.54g/mol. Its melting point is 1083oC and boiling point is 2595oC. Copper is very dense in nature its density at 20oC is 8.9 g/cm3. Copper is biostatic in nature that means no bacteria and other forms of life can grow on it. Various alloys of copper also have antimicrobial properties.

Chemical characteristics

Copper has low chemical activity, it slowly reacts with oxygen and form a layer of brown black copper oxide that protects the underlying metal from further corrosion. Copper compound exist in two oxidation state +1 and +2. +2 compounds are blue in color. +1 compounds are white in color. They are weak oxidizing agent. Copper (I) compounds are weak reducing agents they react with air and make copper (II) compounds. They are not dissolve in water. Copper (II) are stable in air than copper(I) compounds. Gases are soluble in molten copper helpful in mechanical and electrical properties of solidified metal. Copper forms many alloys by mixing with other metals, most common alloys are brass and bronze.



Copper has 29 isotopes 63Cu and 65Cu are stable in nature. Other isotopes are radioactive in nature, 67Cu has half-life 61.83 hours.

Uses and significance

  • Copper is frequently used in wires, as it is an excellent conductor of electricity [4].
  • Copper has been used in making sculpture, it was also used in the construction of Statue of Liberty.
  • Copper is also used in photographic techniques.
  • Copper is used as fungicide in agriculture.
  • Copper is very important in countless types of electrical equipment.
  • Electrical devices rely on copper wiring due to its inherent properties.
  • Copper is corrosion resistant and present in weatherproof architectural materials.
  • Various alloys of copper are widely used in making jewelry.
  • Copper is used in textile industry for making of antimicrobial protective fabrics.
  • In past, copper chloride has been used to treat fever, arthritis and sciatica.

Dietary recommendations.

U.S recommended dose of copper is about 1.4 to 2.1mg per kg body mass.


Health effects

Copper is helpful in facilitating iron uptake that’s why its deficiency can lead to anemia[3]. Too much copper in diet also cause various problems. Human get copper mostly in the form of food and vitamin supplements. Various genetic disorders can affect the ability of body to use copper properly. Intake of copper is helpful to prevent cardiovascular diseases and osteoporosis. Copper enables body to make red blood cells.


Other Periodic Table Elements

Copper 64 Mass Number

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