What is the atomic mass of copper

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)

For instance, it can be determined experimentally that neon consists of three isotopes: neon-20 (with 10 protons and 10 neutrons in its nucleus) with a mass of 19.992 amu and an abundance of 90.48%, neon-21 (with 10 protons and 11 neutrons) with a mass of 20.994 amu and an abundance of 0.27%, and neon-22 (with 10 protons and 12 neutrons) with a mass of 21.991 amu and an abundance of 9.25%. The average atomic mass of neon is thus:

0.9048	�	19.992 amu	=	18.09 amu
0.0027	�	20.994 amu	=	0.057 amu
0.0925	�	21.991 amu	=	2.03 amu
				20.18 amu

The atomic mass is useful in chemistry when it is paired with the mole concept: the atomic mass of an element, measured in amu, is the same as the mass in grams of one mole of an element. Thus, since the atomic mass of iron is 55.847 amu, one mole of iron atoms would weigh 55.847 grams. The same concept can be extended to ionic compounds and molecules. One formula unit of sodium chloride (NaCl) would weigh 58.44 amu (22.98977 amu for Na + 35.453 amu for Cl), so a mole of sodium chloride would weigh 58.44 grams. One molecule of water (H2O) would weigh 18.02 amu (2�1.00797 amu for H + 15.9994 amu for O), and a mole of water molecules would weigh 18.02 grams.

The original periodic table of the elements published by Dimitri Mendeleev in 1869 arranged the elements that were known at the time in order of increasing atomic weight, since this was prior to the discovery of the nucleus and the interior structure of the atom. The modern periodic table is arranged in order of increasing atomic number instead.

Copper

Name	Copper
Symbol	Cu
Atomic Number	29
Atomic Mass	63.546 atomic mass units
Number of Protons	29
Number of Neutrons	35
Number of Electrons	29
Melting Point	1083.0� C
Boiling Point	2567.0� C
Density	8.96 grams per cubic centimeter
Normal Phase	Solid
Family	Transition Metal
Period	4
Cost	$2.93 per kilogram

Origin of Name	From the Latin word cuprium, referring to the island of Cyprus
Date of Discovery	Known to the ancients
Discovered by	Copper beads dating back to 9000 B.C. were found in Iraq
Common Compounds	Copper chloride (CuCl2) Copper cyanide (CuCN) - electroplating Cuprous chloride (CuCl) - absorbs carbon dioxide Hydrated copper sulfate (CuSO4�H2O) - the most well known
Interesting facts	Pure copper rarely occurs in nature. It is found in minerals such as azurite, malachite and bornite. It is obtained by smelting, leaching or electrolysis. Each year about 6,540,000 tons of copper is mined in the United States, Zaire, Zambia, Canada, Chile, Cyprus, Russia and Australia.
Common Uses	Electrical conductors Jewelry (clocks and watches) Boat bottoms to keep them from sinking Coins Bronze art such as sculptures The Statute of Liberty's skin is copper

Is the atomic mass of copper is 64?

The atomic mass of copper is 64 amu, while the atomic mass of oxygen is 16 amu.

Is copper atomic mass 63 or 64?

The atomic weight of copper is based on this isotropic distribution and comes out to 63.546 amu, even though there is not a single atom of copper that weighs 63.546 amu (69% of them weigh 63 amu and 31% weigh 65). Figure 2.3. 3: Copper has two stable isotopes as indicated in the pie diagram.