Question

Define a non-metal. Arrange the major metallic elements present in the earth crust in decreasing order of
their percentage of occurrence?​

Answer 1

Answer:

Metal → A substance with high electrical conductivity, lustre, and malleability, which readily loses electrons to form positive ions (cations).

The decreasing order of percentage of occurrence of major metallic elements present in the earth crust is-

Fe>Ca>Na>Mg

Answer 2

Answer:

Chemical Elements that lack the predominance of metallic properties are called Non-Metals.

Explanation:

Non-Metals lack the predominance of metallic properties such as Lustre, Deformability, thermal and Electrical conductivity, low Electronegativity etc. Most of the Nonmetals have a low density, low melting and boiling point, poor heat and electric conductivity, and high Electronegativity. Most of the non-metals are in a gaseous state or as shiny Solids. Hydrogen, Oxygen, Nitrogen, Sulfur, Chlorine, Bromine etc. are some widely known Non-Metals.

"Any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light are known as Metallic Elements."
The metallic elements present in the Earth's Crust are:

Aluminium: 8.2%
Iron: 5.6%
Calcium: 4.2%
Sodium: 2.4%
Magnesium: 2.3%
Potassium: 2.1%
Titanium: 0.6%


To know more about Metal and non metals:
https://brainly.in/question/2011603


To know more about Earth's Crust:
https://brainly.in/question/8035173



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