Q1 of 75 Page 55

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

It is necessary to use the symbol for the elements because by writing symbols of the elements, chemical equations become easier to write as well as to understand and saves time too.

For example:


Zinc – Zn


Hydrogen – H


Aluminium – Al


Calcium – Ca


Sodium – Na


Lithium – Li


More from this chapter

All 75 →
4

In a given sample of ammonia, 9g hydrogen and 42g nitrogen are present. In another sample, 5g hydrogen is present along with nitrogen. Calculate the amount of nitrogen in the second sample.

 5

Why definition of an atom given by Dalton is no longer valid?

 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)

 3

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