Question

Name of the elements symbol valency weather metal non metal mettaloid

Answer 1

List of Nonmetals (Element Group)
There are 7 elements that belong to the nonmetals group:

Hydrogen (sometimes considered an alkali metal)
Carbon
Nitrogen
Oxygen
Phosphorus
Sulfur
Selenium
Although these are the elements in the group nonmetals, there are two additional element groups that could be included, since the halogens and noble gases also are types of nonmetals.

List of All Elements That Are Nonmetals
So, if we include the nonmetals group, halogens, and noble gases, all of the elements that are nonmetals are:


Hydrogen (sometimes)
Carbon
Nitrogen
Oxygen
Phosphorus
Sulfur
Selenium
Fluorine
Chlorine
Bromine
Iodine
Astatine
Tennessine (sometimes considered a halogen or metalloid)
Helium
Neon
Argon
Krypton
Xenon
Radon
Oganesson (possibly behaves as a "noble gas", except it won't be a gas under ordinary conditions)
Metallic Nonmetals
Nonmetals are classified based on their properties under ordinary conditions. Metallic character isn't an all-or-nothing property. Carbon, for example, has allotropes that behave more like metals than nonmetals. Sometimes this element is considered to be a metalloid rather than a nonmetal. Hydrogen acts as an alkali metal under extreme pressure. Even oxygen has a metallic form as a solid.

Significance of the Nonmetals Element Group
Even though there are only 7 elements within the nonmetals group, two of these elements (hydrogen and helium) make up about 98% of the mass of the universe.1 Nonmetals form more compounds than metals. Living organisms consist mainly of nonmetals.