Define metal.Arrange the major mettalic elements present in the earth crust in decreasing order of their percentage of occurcence
Answers
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:
Metals are naturally formed below the surface of the Earth. Most of the metals are lustrous or shiny. Metals are made of such substances which were never alive.
- They are found naturally in the earth’s crust in the form of metal ores.
- They are mixed with each other and also with some other elements. They also appear in form of atmospheric dust.
- They are malleable, strong, ductile and good conductors of electricity and heat.
- Metals are used in the manufacture of cooking utensils, automobiles and satellites.
- Most of the metals are typically hard.
- Potassium and Sodium are exceptional. They can cut by knives.
- Most metals are solid except mercury. Mercury is only metal that is liquid metal at room temperature.
The naturally occurring chemical substance in which metal occur is called mineral. The mineral from which the metal can be economically or chemically extracted.
Decreasing order of percentage of occurrence of metals in earth's crust:-
Si > Al > Fe > Ca > Na > K > Mg
Aluminum occurs in the earth's crust in the form of mineral Bauxite and clay. Iron occurs in the form of Hematite and Magnetite.