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Q. The Most Abundant Metal in Earth’s Crust Is:
(a) iron
(b) magnesium
(c) calcium
(d) aluminium
Ans:- The most abundant metal in earth’s crust is: Aluminium.
Explanation:- Aluminium is the most abundant metal in the earth’s crust. It has a density lower than the other common metals. It has a great affinity toward oxygen and forms a protective oxide layer on the surface when exposed to the air. Aluminium looks or appears like silver as its colour and ability to reflect light. An aluminium atom has 13 electrons arranged in an electron configuration with three electrons beyond a stable noble gas configuration. The combined first three ionisation energies of aluminium are far lower than the fourth ionisation energy alone.
Aluminium metal has an appearance of silvery grey depending upon the surface roughness. A new aluminium film serves as a good reflector of visible light and an excellent reflector of medium and far-infrared radiation. Aluminium mirrors are the most reflective metal mirror for ultraviolet and infrared light. Pure aluminium is quite soft and lacking in strength. The aluminium chemical formula is AI, and the atomic number is 13. It is a ductile metal. It is a highly reactive metal. The density of aluminium is low. It resists corrosion by reacting with the air and forming an aluminium oxide film. This is known as passivation. Aluminium is found in the compound state, only never in the raw state, as it is light in weight, robust and soft, so it can be easily moulded.
