Give the salient features of " Modern atomic theory ".

Explanation

An atom is no longer indivisible :
(i) Atoms of the same element may have different atomic mass . E.g isotopes `""_(17) Cl ^(35) ,""_(17) Cl ^(37)`.
(ii) Atoms of different elements may have same atomic masses , e.g Isobars `""_(18) Ar ^(40) , S_(20) Ca ^(40) ` .
(iii) Atoms of one element can be transmuted into atoms of other elements . Atom is no longer indestrutible discovery of artificial transmutation .
(iv ) Atoms may not always combine in a simple whole number ratio . e.g Glucose `C_(6) H_(12) O_(6) `
(v ) Atom is the smallest particle that take part in a chemical reaction .
(vi ) Mass of an atom can be converted into energy . E`=mc ^(2) ` .