are the chapters :periodic classification of elements, chemical bonding and chemical reactions included in our syllabus? 

Dear Student,

These chapters are a part of Class 10.

For your syllabus kindly refer to the below mentioned link:

https://www.meritnation.com/cbse/class9/synopsis/science/science/1_9_2_8

Hope this information clears your doubts about the topic.

Keep asking!!

Regards