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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
What are the main features of Mendeleev’s periodic table?
Name three elements with filled outermost shells.
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
State any three demerits of Mendeleev’s periodic table.
On what basis elements are arranged in periodi table now?
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.
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
State Mendeleev's periodic law.
Why did Mendel choose garden pea for his experiments? Write two reasons.
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.
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.
Use Mendeleev's Periodic Table to predict the formula of oxides of potassium, aluminum, and barium.
Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.
What are the demerits of Mendeleev’s periodic table?
What were the defects and anomalies in Mendeleeff's Periodic Table and how are they resolved by Moseley?
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
At the time of Mendeleev _______ elements were known.
Beryllium : alkaline earth metal : : sodium: _______
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?
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.
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?
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?
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 ______
On moving from left to right in a period in the periodic table, the size of the atom.
List the features of Mendeleev’s Periodic Table.
