Table of Contents
What is helium an example of?
helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).
Is carbon dioxide an element?
Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom.
What are the Group 6 elements called?
chalcogens
Group 6A (or VIA) of the periodic table are the chalcogens: the nonmetals oxygen (O), sulfur (S), and selenium (Se), the metalloid tellurium (Te), and the metal polonium (Po).
Is carbon a metal?
Carbon is a solid non-metal element. Pure carbon can exist in very different forms. The most common two are diamond and graphite. Graphite is unusual because it is a non-metal that conducts electricity.
What is the group of rhodium?
Group 9
Fact box
| Group | 9 | Melting point |
|---|---|---|
| Period | 5 | Boiling point |
| Block | d | Density (g cm−3) |
| Atomic number | 45 | Relative atomic mass |
| State at 20°C | Solid | Key isotopes |
Is carbon An example of gas?
Carbon dioxide, CO2, is a gas during room temperature, and is a gas in the earth¡¯s atmosphere. It is a made up of about 385 ppm in the Earth’s atmosphere. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.
What are helium and other elements used for?
Helium is used as a cooling medium for the Large Hadron Collider (LHC), and the superconducting magnets in MRI scanners and NMR spectrometers. It is also used to keep satellite instruments cool and was used to cool the liquid oxygen and hydrogen that powered the Apollo space vehicles.
Which is an example of a chemical compound?
Examples of compounds include water ( or hydrogen oxide ) H2O; and Sodium Chloride, NaCl. H is the symbol for hydrogen; the number 2 as used here means there are 2 atoms of the element hydrogen in every molecule of the compound water.
Which is the major source of helium in the atmosphere?
The major source is natural gas, which can contain up to 7% helium. In 1868, Pierre J. C. Janssen travelled to India to measure the solar spectrum during a total eclipse and observed a new yellow line which indicated a new element.
Which is the chemical symbol for the element carbon?
Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Carbon is one of the few elements known since antiquity.