Which of the following elements is not present abundantly in earth's crust:
Correct answer: C. Sodium
- A. Silicon
- B. Aluminium
- C. Sodium
- D. Oxygen
Explanation
The s-block elements are the metals in Group IA and Group IIA of the periodictable.They are called the s-block elements because sorbitals are being filled, in their outer most shells.The elements of group IA except hydrogen arecalled "Alkali metals" while those of IIA are named "Alkaline-earth metals".The name alkali came from Arabic, which means 'The Ashes'. The Arabs used this term for these metals because they found that the ashes of plants were composed chiefly of sodium and potassium. Alkali metals include the elements, lithium, sodium, potassium, rubidium, caesium and francium. These are very reactive metals, produce strong alkaline solutions with water.The alkaline-earth metals are beryllium, magnesium, calcium, strontium, barium and radium.They are called alkaline-earth because they produce alkalies in water and are widely distributed in earth's crust.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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