Periodic Classification of Elements : CBSE Class 10 X Science (Chemistry)
Hello student, in this video we are going to learn topic named as Periodic classification of the elements form class 10 science chemistry.
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Let’s start with a summary as
Elements :
Substances containing atoms of only one type. e.g Na, Au, Mg, etc. There are around 118 elements known to us. The first classification of elements was into Metals and Non-metals. Elements are classified to make the study easy.
The earliest attempt to classify the elements resulted in grouping the then known elements as metals and non-metals. Later further classifications were tried out as our knowledge of elements and their properties increased.
In the year 1817, Johann Wolfgang Döbereiner, a German chemist, tried to arrange the elements with similar properties into groups. He identified some groups having three elements each. So, he called these groups ‘triads’.
Dobereiner’s Triads :
When the elements were written in order of increasing atomic masses the atomic mass of the middle was the average of the atomic mass of the other two elements.
Newland’s Law of Octaves
Based on increasing atomic mass of elements.
Law of Octaves: When elements are arranged it was found that every eighth element had properties similar to that of the first. e.g properties of sodium and Lithium are the same.
All the above-mentioned topics are described in an interactive and efficient manner so that the students could easily understand them.
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Jii
Or video banaao
According to our book there are 118 elements and you have showed only 115 elements in the introduction of this video
please try to remember that there are not only hindi students who studies cbse
118 elements are present
118 element
thanks Sir
You are great sir
Sir 10 th ke class kab chalu kar raha ho
Please make lesson in Kannada
Nice
Where is full video sir???
Nice video
Very good sir
Super
sir 10 th class structure of atom chapter full video upload kariyana
Nice explanation:)
Sir…. atleast vedio OK end tk explain krye
Sir aap 1 acche teachers h
Nic video
Thank u sir
Pls sir sst Ko hindi m e teach kariye 10 CBSE nice video
Coments
Sir aap please skin Ke Samne Ho Kar Padai karo to Hame Jada samaj aata hai
complete the chapter. please
Sir please me second part of video
This was the great way of teaching we like it,thankyou sir
Now I want the all concept about mendeelev periodic table
Mandleev was not get noble prize her student mosley who get noble prize
Sir its super cool
Elements are 120
sir sari video banao na….
Thanku sir very nice
Should we have to learn all table? Is it necessary ?
part 2