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प्रश्न
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
विकल्प
Right
Wrong
उत्तर
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements- Right
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संबंधित प्रश्न
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, Al, Si, Ba.
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
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.
On what basis elements are arranged in periodi table now?
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
State Mendeleev's periodic law.
Write a short note.
Mendeleev’s periodic law.
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?
Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.
What are the demerits of Mendeleev’s periodic table?
How did Mendeleev arrange the elements in the periodic table?
State the contributions made by Mendeleev towards the periodic table.
What were the defects and anomalies in Mendeleeff's Periodic Table and how are they resolved by Moseley?
Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.
According to Mendeleev’s periodic law properties of elements are ______.
Write scientific reason.
There was no definitive place for isotope in Mendeleev’s periodic table.
State Mendeleev’s Periodic Law.
What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?
What challenges did Mendeleev face in following periodic law?
At the time of Mendeleev, the number of elements known was ______
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have the same atomic masses
(ii) Isotopes of an element have the same atomic number
(iii) Isotopes of an element show the same physical properties
(iv) Isotopes of an element show the same chemical properties
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
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
In Mendeléev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.
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?
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
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?
