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प्रश्न
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
उत्तर
| Mendeleev’s periodic table | Modern periodic table | |
| 1. | Elements are arranged in increasing order of their atomic masses. | Elements are arranged in increasing order of their atomic numbers. |
| 2. | It is not divided into any blocks. | It is divided into four blocks, namely s-block, p-block, d-block and f-block. |
| 3. | There are 8 groups. | There are 18 groups. |
| 4. | Isotopes could not be placed properly. | Isotopes occupy the same position as the element. |
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संबंधित प्रश्न
Name three elements that have a single electron in their outermost shells.
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?
Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as
State any three demerits of Mendeleev’s periodic table.
State whether the following statement is true of false:
According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic numbers.
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
What chemical properties of elements were used by Mendeleev in creating his periodic table?
(a) Write its electronic configuration and determine its valency.
(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.
(c) Is it a metal or a non-metal?
(d) Write the formula of its oxide.
List two contrasting visible characters of garden pea Mendel used for his experiment.
Write a short note.
Mendeleev’s periodic law.
State Mendeleev's periodic law.
Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.
How many elements were known at the time of Mendeleev's classification of elements?
What are the demerits of Mendeleev’s periodic table?
How did Mendeleev arrange the elements in the periodic table?
What was the basis of Mendeleev's classification?
How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?
State the contributions made by Mendeleev towards the periodic table.
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
In Mendeleev’s periodic table eka- silicon was later named as _______.
According to Mendeleev’s periodic law properties of elements are ______.
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
Write scientific reason.
There was no definitive place for isotope in Mendeleev’s periodic table.
What challenges did Mendeleev face in following periodic law?
What are the limitations of Mendeleev's periodic table?
In Mendeleev’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?
At the time of Mendeleev, the number of elements known was ______
An element has 12 protons. The group and period to which this element belongs is ______
Which of the following oxide is most basic?
Eka-aluminium and Eka-silicon are known as ______
Which of the following statement (s) about the Modern Periodic Table are incorrect
- The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
- The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
- Isotopes are placed in adjoining group (s) in the Periodic Table
- The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
On moving from left to right in a period in the periodic table, the size of the atom.
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”
List the features of Mendeleev’s Periodic Table.
