Advertisements
Advertisements
Question
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
Solution
Mendeleev found that there was a close relation between atomic weights and properties of elements. He also found that when elements are arranged in increasing order of their atomic weights, the properties repeat at regular intervals.
He even left some gaps for the elements not know at that time whose properties resembled the neighbouring elements. Predicted properties of eKa Aluminium (before discovery) are exactly the same as actual properties of gallium element (after discovery).
Moreover, he arranged all the 63 elements known at that time. Still, there were many drawbacks in this periodic table, but Mendeleeff laid the foundation of modern periodic table.
APPEARS IN
RELATED QUESTIONS
Why did Mendel choose garden pea for his experiments? Write two reasons.
State Mendeleev's periodic law.
How many elements were known at the time of Mendeleev's classification of elements?
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
What challenges did Mendeleev face in following periodic law?
What are the limitations of Mendeleev's periodic table?
According to Mendeléev's Periodic Law, the elements were arranged in the periodic table in the order of
In Mendeléev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later
Properties of the elements are given below. Where would you locate the following elements in the periodic table?
- A soft metal stored under kerosene
- An element with variable (more than one) valency stored under water.
- An element which is tetravalent and forms the basis of organic chemistry
- An element which is an inert gas with atomic number 2
- An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “ anodising”
Name the elements whose compounds formed the basis of classification in Mendeleev's periodic table. Why did Mendeleev choose these elements?
How the formulae of these compounds had helped Mendeleev in deciding the position of an element in his periodic table?
