the time when copper discovered and used is called
Answers
neolithic age and it was called bronze maybe
Explanation:
Copper
Appearance
red-orange metallic luster
Standard atomic weight Ar, std(Cu)
63.546(3)[1]
Copper in the periodic table
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Caesium
Barium
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury (element)
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Nihonium
Flerovium
Moscovium
Livermorium
Tennessine
Oganesson
–
↑
Cu
↓
Ag
nickel ← copper → zinc
Atomic number (Z)
29
Group
group 11
Period
period 4
Block
d-block
Element category
Transition metal
Electron configuration
[Ar] 3d10 4s1
Electrons per shell
2, 8, 18, 1
Physical properties
Phase at STP
solid
Melting point
1357.77 K (1084.62 °C, 1984.32 °F)
Boiling point
2835 K (2562 °C, 4643 °F)
Density (near r.t.)
8.96 g/cm3
when liquid (at m.p.)
8.02 g/cm3
Heat of fusion
13.26 kJ/mol
Heat of vaporization
300.4 kJ/mol
Molar heat capacity
24.440 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1509 1661 1850 2089 2404 2834
Atomic properties
Oxidation states
−2, 0,[2] +1, +2, +3, +4 (a mildly basic oxide)
Electronegativity
Pauling scale: 1.90
Ionization energies
1st: 745.5 kJ/mol
2nd: 1957.9 kJ/mol
3rd: 3555 kJ/mol
(more)
Atomic radius
empirical: 128 pm
Covalent radius
132±4 pm
Van der Waals radius
140 pm
Color lines in a spectral range
Spectral lines of copper
Other properties
Natural occurrence
primordial
Crystal structure
face-centered cubic (fcc)Face-centered cubic crystal structure for copper
Speed of sound thin rod
(annealed)
3810 m/s (at r.t.)
Thermal expansion
16.5 µm/(m·K) (at 25 °C)
Thermal conductivity
401 W/(m·K)
Electrical resistivity
16.78 nΩ·m (at 20 °C)
Magnetic ordering
diamagnetic[3]
Magnetic susceptibility
−5.46·10−6 cm3/mol[4]
Young's modulus
110–128 GPa
Shear modulus
48 GPa
Bulk modulus
140 GPa
Poisson ratio
0.34
Mohs hardness
3.0
Vickers hardness
343–369 MPa
Brinell hardness
235–878 MPa
CAS Number
7440-50-8
History
Naming
after Cyprus, principal mining place in Roman era (Cyprium)
Discovery
Middle East