Physical Properties of Non-Metals

Non-metals are substances that do not possess any of the characteristics of metals. They are excellent insulators of both heat and electric current. They are largely gases, with some liquids thrown in for good measure. Some of them, such as carbon, sulphur, and phosphorus, are even solid at normal room temperatures.

Physicochemical Characteristics of Nonmetals

High ionisation energies and electronegativity are two characteristics of nonmetals that distinguish them from metals. Because of these characteristics, nonmetals typically gain electrons when reacting with other compounds, resulting in the formation of covalent bonds. The anionic dopants, which are found in non-metals, have a significant impact on the VB. Carbon, nitrogen, fluorine, sulphur, and iodine are examples of non-metal dopants.

General characteristics of non-metals:

1. The atoms of nonmetals are typically smaller in size than the atoms of metals. The atomic sizes of nonmetals are responsible for a number of their other characteristics.
2. Non-metals have extremely low electrical conductivities compared to metals. In non-metals, the lowest or non-existent electrical conductivity is the most essential attribute that distinguishes them from metallic counterparts.
3. Non-metals have high electronegativities, whereas metals have low electronegativities. Thus, non-metal atoms have a strong tendency to attract more electrons than they would otherwise have.
4. Non-metals have high electronegativities, whereas metals have low electronegativities. In other words, the atoms of non-metals have a strong inclination to hold on to the electrons that they have already accumulated. Metals, on the other hand, readily give up one or more electrons to non-metals, resulting in the formation of positively charged ions and the conductivity of electrical current.
5. Some non-metals are discovered as gases, while others are found as solids, and one is found as a liquid when exposed to typical temperature and pressure conditions. At room temperature, on the other hand, all metals, with the exception of mercury, are solids. In light of the fact that a large number of non-metals exist as liquids or gases, non-metals have generally low melting and boiling points under normal atmospheric circumstances.
6. Nonmetals have a tendency to be fragile when in their solid state. As a result, they lack the malleability and ductility that metals possess.

Physical Characteristics of Non-Metallic Materials 

1. Ductility is a property of the material that will be stretched into wires, but non-metals, with the exception of carbon, are not ductile. Carbon fibres are used in a variety of industries, including sports and music equipment, and are therefore not ductile.
2. The trait of malleability, which is characteristic of metals, is missing in nonmetallic materials. They cannot be drawn into sheets because they are brittle and break when pressure is applied to them.
3. They do not have a lustrous aspect since they do not have any shine to them.
4. In the event that they are struck by another material, they do not produce any sonorous tones or produce a deep ringing sound. With the exception of graphite, they are also poor conductors of heat and electricity.

Non-metals are listed in alphabetical order (the Complete List)

Hydrogen Gas- H

Nitrogen Gas- N

Oxygen Gas- O

Fluorine Gas- F

Chlorine Gas- Cl

Bromine Liquid- Br

Iodine Solid- I

Carbon Solid- C

Sulphur Solid- S

Phosphorus Solid- P

Silicon Solid- Si

Chemical Properties of Non-Metals

One of the most important reactions is the reaction between a non-metal and water. A non-metal does not react with water, but it is usually very reactive in air, which is why some of them are stored in water. For example, phosphorus is one of the extremely reactive non-metals, and when exposed to air, it ignites, which is why it is held in water to avoid contact with ambient oxygen during storage.

Reactions with Acids and Bases

There is no evidence that any of the non-metals react with acids.

1. Base Reactions and Reactions with Bases

There are several variables involved in the interaction between nonmetals and bases. The interaction of chlorine with bases such as sodium hydroxide results in the formation of compounds such as sodium hypochlorite, sodium chloride, and water.

1. Reaction with Oxygen (or other gas)

When non-metals react with oxygen, they generate oxides of non-metals (NMOX). In nature, the oxides of nonmetals are either acidic or neutral in pH.

When sulphur reacts with oxygen, we get sulphur dioxide. Sulphur dioxide is toxic.

SO2 is formed when S and O2 combine.

It is formed when sulphur dioxide combines with water to generate sulphurous acid.

H2SO3 is formed by the reaction of SO2 and H2O.

Non-Metal Materials Applications

1. Nitrogen is utilised in the production of ammonia, nitric acid, and fertilisers, among other things.
2. When it comes to water filtration, chlorine is employed most often.
3. The usage of hydrogen as a rocket fuel is extremely advantageous.
4. When carbon is in the form of graphite, it can be utilised to manufacture pencils and other writing implements.
5. Sulphuric acid is produced through the use of sulphur.