Which of the following does not represent dobereiners traid
a) Li, Na, K b) Be, Mg, Ca c) N, P, As D) Cl, Br, l
can you please give me the answer
Answers
Answer:
c) N,P,As
Explanation:
as the sum atomic no.s of element N and As is not equal to P.
Answer:
Explanation:
The drawbacks of both the system of classification mentioned above are also explained in the chapter, Periodic Classification of Elements. In Newland's law of orders, the comparison of elements with that of notes of the musical instrument is shown.
The second section of the chapter, Periodic Classification of Elements talks about Mendeleev's periodic table wherein, the classification of elements is done on the basis of the atomic mass of the elements. The similarity in the chemical properties of elements is explained on the basis of their atomic mass unit. Here, the concepts of groups and periods are explained along with the diagrammatic representation of Mendeleev's table. The achievements and limitations of Mendeleev's periodic table are also covered in the chapter, Periodic Classification of Elements.
The third section of the chapter lays emphasis on the understanding of the modern periodic table. Here, the concept of the atomic number of elements is well explained. The modern periodic table is also represented in the chapter, Periodic Classification of Elements. The position of the elements in the modern periodic table is explained based on the properties like valency, atomic size etc. of the elements.
The metallic and non-metallic properties of elements are explained with respect to its position in the modern periodic table given in the chapter.
The chapter, Periodic Classification of Elements covers the following topics
Making Order Out Of a Chaos - Early Attempts at the Classification Of Elements
Making Order Out Of a Chaos - Mendeleev's Periodic Table
Making Order Out Of a Chaos - The Modern Periodic Table