Q3 of 75 Page 55

Name any two elements whose symbols do not start with the same letter as that of the name of the element.

Elements whose symbols do not start with the same letter as that of the name of the element are:


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1

Why is it necessary to use the symbol for the elements?

 2

What is wrong with the following symbols? Give the correct symbol in each case.

(i) Sodium (So)


(ii) Hydrogen (Hg)


(iii) Copper (Co)


(iv) Sulphur (S)


(v) Calcium (CA)

 4

Why the symbols of few elements, like sodium, do not start with the initial letter of the name?

 5

What is the difference between 2 Cl and Cl2? Which one of these two forms exist in nature? Also, give the atomic mass of this element.