question_answer

                  Describe briefly the properties of group-17 elements (halogen family). State two examples of the compounds in which halogen display positive oxidation states. 

Answer:

  (a) Because fluorine is more electronegative than oxygen, hence binary compounds of oxygen and fluorine should be called oxygen fluoride   and not fluorine oxide. (b) (i) small size                 (ii) high (iii) high electro negativity (iv) diatomic (c) Properties of oxygen are different from the rest of the elements of group -16. This is called anomalous behavior of oxygen. Due to small size, high ionisation enthalpy,       high electro negativity and absence of d-orbital oxygen shows anomalous behaviour,