There are 11:
Name: Nitrogen Symbol: N
Type: Non-Metal Atomic weight: 14.0067
Density @ 293 K: 0.0012506 g/cm3 Atomic volume: 17.3 cm3/mol
Discovered: Nitrogen was discovered by Daniel Rutherford in Scotland in 1772. Rutherford removed oxygen and carbon dioxide from air and showed that the residual gas could not support combustion or living organisms. He called his discovery noxious air.
Name: Oxygen Symbol: O
Type: Non-Metal, Chalcogen Atomic weight: 15.9994
Density @ 293 K: 0.001429 g/cm3 Atomic volume: 14.0 cm3/mol
Discovered: Oxygen was discovered in 1774 by J. Priestley in England and independently by C. W. Scheele in Sweden. The word oxygen is derived from the Greek words 'oxys' meaning acid and 'genes' meaning forming.
Name: Fluorine Symbol: F
Group: Halogen Atomic weight: 18.998403
Density @ 293 K: 0.001696 g/cm3 Atomic volume: 17.1 cm3/mol
Group: Halogen Discovered: 1886
Name: Chlorine Symbol: Cl
Type: Halogen Atomic weight: 35.453
Density @ 293 K: 0.003214 g/cm3 Atomic volume: 22.7 cm3/mol
Discovered: Chlorine was produced first in 1774 by Carl Wilhelm Scheele, who observed the greenish-yellow gas released by the reaction of pyrolusite (manganese dioxide) with the substance we now call hydrochloric acid. Scheele mistakenly thought the resulting gas contained oxygen. In 1810, Sir Humphry Davy confirmed this gas was an element, not a compound. He named it chlorine, from the Greek word 'chloros', meaning pale green.
Name: Helium Symbol: He
Group: Noble Gas Atomic weight: 4.00260
Density @ 293 K: 0.0001787 g/cm3 Atomic volume: ?
Group: Noble Gas Discovered: 1895
Name: Neon Symbol: Ne
Type: Noble Gas Atomic weight: 20.179
Density @ 293 K: 0.0009 g/cm3 Atomic volume: 16.7 cm3/mol
Discovered: Neon was discovered in 1898 by William Ramsay and Morris Travers during experiments with liquid air. The name comes from the Greek word 'neon', meaning new.
Name: Argon Symbol: Ar
Type: Noble Gas Atomic weight: 39.948
Density @ 293 K: 0.001784 g/cm3 Atomic volume: 22.4 dm3/mol at 0 oC, 101.325 kPa.
Discovered: 1894 by Lord Rayleigh and Sir William Ramsay who sought to explain why nitrogen from air appeared to be heavier than nitrogen released from compounds. They discovered that air-sourced nitrogen contained another gas that is nearly one-and-a-half times denser than nitrogen. After isolating the new gas, the first of the noble gases to be discovered, the scientists named it argon ("the inactive one") and found it made up almost one percent of air. Rayleigh said, "Argon must not be deemed rare. A large hall may easily contain a greater weight of it than a man can carry."
Name: Krypton Symbol: Kr
Group: Noble Gas Atomic weight: 83.80
Density @ 293 K: 0.003708 g/cm3 Atomic volume: 38.9 cm3/mol
Group: Noble Gas Discovered: 1898
Name: Xenon Symbol: Xe
Group: Noble Gas Atomic weight: 131.30
Density @ 293 K: 0.00588 g/cm3 Atomic volume: 37.3 cm3/mol
Group: Noble Gas Discovered: 1898
Name: Radon Symbol: Rn
Group: Noble Gas Atomic weight: 222
Density @ 293 K: 0.00973 g/cm3 Atomic volume: 50.5 cm3/mol
Group: Noble Gas Discovered: 1900
Source: http://www.chemicool.com
11, H, He, O, N, F, Ar, Ne, Kr, Cl, Xe, Rn
11
They do not exist in a stable natural state. They had to be made by man in the same way as many of the Actinides This is wrong. Unlike most actinides, they all exist as stable isotopes and some are reasonably common. The main reason is that they are very chemically similar to one another and thus are hard to isolate as pure elements. this is rite...
All noble gases elements are gases.
zero (0)
Very few elements exist in their free state in nature. The vast majority of them exist as compounds, chemically bonded to other elements.
Most elements are sufficiently reactive so it can not exist in elemental form.
Elements can either be synthetic or natural. Synthetic elements are made artificially in laboratories, while natural elements exist in their natural state in nature. Natural elements can further be defined as native elements. These elements exist in their uncombined state.
It depends which elements you are talking about. Some would exist as solids at this temperature while others would be gases or liquids.
Gases may be elements, compounds, or mixtures. A gas is a phase state of matter.
They do not exist in a stable natural state. They had to be made by man in the same way as many of the Actinides This is wrong. Unlike most actinides, they all exist as stable isotopes and some are reasonably common. The main reason is that they are very chemically similar to one another and thus are hard to isolate as pure elements. this is rite...
The 2 metal which exist in gases state are metallic hydrogen and the two allotropes of oxygen which are dioxygen and ozone.
All gases exist in molecular form except noble gases.
All noble gases elements are gases.
Simply because they exist in their natural state. Most elements are naturally found in compounds (ores, minerals) and must be processed to access the actual elements.
The periodic table doesn't distinguish between liquids, solids and gases. Any element can exist in any such state depending on the temperature.
solid
zero (0)
Yes because some elements exist in their natural state as diatomic molecules, and are thus both elements and molecules.See the Related Questions for a complete list of the diatomic molecules.