A non-metal is an element on the periodic table that does not have the properties of a metallic element, such as malleability. Nonmetals are usually found in nature as gases or weak, brittle solids.
All group 17 and 18 elements are nonmetals, as well as hydrogen, carbon, nitrogen, oxygen, phosphorous, sulfur, and selenium.(Chemistry / Elements & Compounds) any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity.
| Name | Symbol | Atomic Number | Atomic Weight |
|---|---|---|---|
| Hydrogen | H | 1 | 1.00794 |
| Boron | B | 5 | 10.811 |
| Carbon | C | 6 | 12.011 |
| Nitrogen | N | 7 | 14.00674 |
| Oxygen | O | 8 | 15.9994 |
| Silicon | Si | 14 | 28.0855 |
| Phosphorus | P | 15 | 30.973762 |
| Sulfur | S | 16 | 32.066 |
| Arsenic | As | 33 | 74.92159 |
| Selenium | Se | 34 | 78.96 |
| Tellurium | Te | 52 | 127.6 |
Selenium is a chemical element with the atomic number 34 in the periodic table. It occurs naturally in Earth’s crust, especially in carbonate rocks and volcanic and sedimentary soils. Being a member of the sulphur group of periodic table elements, this chalcogen has six electrons in the outermost shell and valences of -2, 4, and … Read more
Sulfur is a chemical element with the atomic number 16 in the periodic table. It’s the 5th most abundant element in Earth’s crust with an approximate concentration of 0.06 percent. Being a member of the oxygen group of the periodic table, this non-metallic chalcogen element has six valence electrons (3s²3p⁴) and can form compounds with … Read more
Phosphorus is a chemical element with the atomic number 15 in the periodic table. It is the eleventh most abundant element in Earth’s crust, with an occurrence of about 0.1% ppm. Due to its high reactivity, phosphorus does not occur freely in nature. Being a member of the nitrogen family of periodic table elements, this … Read more
Oxygen is a nonmetallic chemical element with atomic number 8 in the periodic table. Occurring with 467,100 ppm or 46% in Earth’s crust, it’s the most abundant element both in the thin outer layer of our planet and the human body. As a member of the oxygen family of periodic table elements, this chalcogen occurs … Read more
Nitrogen (Azote) is a chemical element with atomic number 7 in the periodic table. It’s the most abundant element on Earth. Nitrogen naturally occurs in the Earth’s atmosphere, crust, mantle, core, as well as in oceans. In Earth’s crust, this substance is present in the form of a liquid metal, while in the atmosphere nitrogen … Read more
Carbon is a chemical element with an atomic number of 6 in the periodic table of elements. It’s the 19th most abundant element found in nature. With a quantity of approximately 0.025 percent in Earth’s crust (2.00×102 milligrams per kilogram), carbon is not really plentiful. However, it is widespread and it’s one of the chemical … Read more
Hydrogen is a chemical element with an atomic number of 1 in the periodic table. Occurring as a part of the H2O molecule, it’s the most plentiful element that occurs in the Universe. With 0.15 % concentration, it’s also the 10th most abundant chemical element in Earth’s crust. As a member of the hydrogen family … Read more