Advertisements
Advertisements
प्रश्न
What are the limitations of Mendeleev's periodic table?
उत्तर
- Elements with large difference in properties were included in the same group. Eg: Hard metals like copper (Cu) and silver (Ag) were included along with soft metals like sodium (Na) and potassium (K).
- No proper position could be given to the element hydrogen. Non-metallic hydrogen was placed along with metals like lithium (Li), sodium (Na) and potassium (K).
- The increasing order of atomic mass was not strictly followed throughout. Eg. Co & Ni, Te &I.
- No place for isotopes in the periodic table.
APPEARS IN
संबंधित प्रश्न
What are the main features of Mendeleev’s periodic table?
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?
On what basis did mandeleev arrange the elements in his periodic table?
Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.
Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
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
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeléev.
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”
