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प्रश्न
At the time of Mendeleev _______ elements were known.
पर्याय
56
65
63
118
उत्तर
At the time of Mendeleev 63 elements were known.
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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.
On what basis elements are arranged in periodi table now?
Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
List two contrasting visible characters of garden pea Mendel used for his experiment.
Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.
State Mendeleev's periodic law.
Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.
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?
State the contributions made by Mendeleev towards the periodic table.
According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.
In Mendeleev’s periodic table eka- silicon was later named as _______.
Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.
Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
On which basis Mendeleev organised periodic law?
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 ______
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
An element has 12 protons. The group and period to which this element belongs is ______
Which of the following oxide is most basic?
Which of the following properties does not match the element of the halogen family?
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
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.
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeléev.
Give an account of the process adopted by Mendeléev for the classification of elements. How did he arrive at “Periodic Law”?
