Question

Write a note on occurrence of the elements.

Answer 1

Answer:

The s - elements of the periodic table are those in which last electron enters the outermost s - orbital. Li, Na, K, Rb, Cs Fr are members of group I, these metals are known as alkali metals theses are so called because they form hydroxide on reaction with water which are strongly alkaline in nature.

and Be, Mg, Ca, Sr , Ba, Ra. are members of group II . These elements are known as alkaline earth metals . these are so called because their oxides and hydroxide are alkaline in nature and also these metals are found in earth's crust.

Among the alkali metals sodium and potassium are abundant and lithium, rubidium and caesium have much lower abundances ( as you can see in below attached table.)

Of the alkaline earth metals calcium and

magnesium rank fifth and sixth in abundance respectively in the earth’s crust. Strontium and barium have much lower abundances. Beryllium is rare and radium is the

rarest metal.

Explanation:

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