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प्रश्न
What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?
उत्तर
The physical and chemical properties of elements that Mendeleev considered while compiling periodic table were:
- The molecular formulae of hydrides and oxides of the elements
- melting points, boiling points and densities of the elements and their hydrides and oxides.
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संबंधित प्रश्न
What are the main features of Mendeleev’s periodic table?
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, Al, Si, Ba.
Name three elements that have a single electron in their outermost shells.
Name two elements that have two electrons in their outermost shells.
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
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
(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.
Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.
Write a short note.
Mendeleev’s periodic law.
Write the merits of Mendeleev’s periodic table.
State Mendeleev's periodic law.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
Which group of elements was missing from Mendeleev's original periodic table?
Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.
Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.
How many elements were known at the time of Mendeleev's classification of elements?
Answer the following question:
Name two elements having a single electron in their outermost shell.
How did Mendeleev arrange the elements in the periodic table?
What was the basis of Mendeleev's classification?
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 ______.
On which basis Mendeleev organised periodic law?
What challenges did Mendeleev face in following periodic law?
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
Which of the following oxide is most basic?
Which of the following properties does not match the element of the halogen family?
The total number of electrons present in the first twenty elements of the periodic table is ______
According to Mendeléev's Periodic Law, the elements were arranged in the periodic table in the order of
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeléev.
Mendeléev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
- Name the elements which have taken the place of these elements
- Mention the group and the period of these elements in the Modern Periodic Table.
- Classify these elements as metals, non-metals or metalloids
- How many valence electrons are present in each one of them?
Give an account of the process adopted by Mendeléev for the classification of elements. How did he arrive at “Periodic Law”?
