Page 1 - 3. LESSON NOTES-(SYMBOLS OF ELEMENTS)
P. 1

SAI International School
                                                Subject-Chemistry

                                            Ch-Atoms and Molecules
                                          Topic-Symbols of elements
                                                  LESSON NOTE



               Atoms: These are the smallest particle of matter which may or may not have an
               independent existence and take part in chemical reactions.


               Molecules:  These  are  the  smallest  particle  of  matter  which  can  exist
                    independently.
               Atoms:
               The smallest tiny particles of matter which can't be divided further is called atom, i.e.,
               an atom is the smallest building block of matter.

               For example: Sodium (Na), Hydrogen (H), Oxygen (O), etc.


               Names of Elements and their Symbols:
               John Dalton in 1808 first used figurative symbols to represent different elements. As
               you can see it is tedious and non-practical hence it was soon abandoned
              IUPAC (International Union of Pure and Applied Chemistry) approves names of
               elements.
              The abbreviation used for lengthy names of elements are termed as their symbols.
              The symbol of an element is formed by writing only the first letter or first letter
               followed by the second or some other letter of English name or Latin name of the
               element.
              While writing a symbol, the first letter is always capital and the second is always
               small.
              Symbols used for some common elements are given below:
































               1
   1   2