Advertisements
Advertisements
प्रश्न
What was the basis of the earliest attempts made for classification and grouping of elements?
Advertisements
उत्तर
The basis of the earliest attempts for the classification of elements was the chemical and physical properties observed by the scientists. Some reactions with known elements and compounds were compared.
The atomic weights were used to order them. To group them into groups they tried to observe the periodicity of the properties as the atomic weight increases. Law of triads and then the law of octaves was proposed. Doberneiner, Chancourtois, and Newlands proposed these laws and prepared some tables.
APPEARS IN
संबंधित प्रश्न
An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason:
Write the position of P and Q in the Modern Periodic Table and the molecular formula of the compound formed when P reacts with Q.
Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw the electron-dot structure of the product and also state the nature of the bond formed between both the elements.
As element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
Give a reason why elements need to be properly classified.
Why was this basis of classification discarded for future classification of elements?
If the distance between two Cl atoms in a Cl2 molecule is 1.98Å, then the radius of the Cl atom is ______.
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
The elements of group 16 are called ______
An element with the atomic number 40 is placed in the period.
What type of oxide would Eka– aluminium form?
