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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

On which basis Mendeleev organised periodic law? - Science and Technology 1

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प्रश्न

On which basis Mendeleev organised periodic law?

टीपा लिहा

उत्तर

  1. Mendeleev organized the period table on the basis of atomic masses of elements.
  2. When he arranged the 63 elements known at that time in the increasing order of their atomic masses, he found that the chemical and physical properties of elements showed repetition after certain fixed interval.
  3. On the basis of this finding, he stated that ‘properties of elements are a periodic function of their atomic masses’. This is known as Mendeleev’s periodic law.
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पाठ 2: Periodic Classication of Element - Answer the Following

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संबंधित प्रश्‍न

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K, C, Al, Si, Ba.


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Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?


By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?


State any three demerits of Mendeleev’s periodic table.


Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.


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.


Write the merits of Mendeleev’s periodic table.


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.


Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.


Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.


Answer the following question:

Name two elements having a single electron in their outermost shell. 


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?


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In Mendeleev’s periodic table eka- silicon was later named as _______.


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?


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?


An element has 12 protons. The group and period to which this element belongs is ______


Which of the following oxide is most basic?


The total number of electrons present in the first twenty elements of the periodic table is ______ 


Eka-aluminium and Eka-silicon are known as ______ 


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.

  1. Name the elements which have taken the place of these elements
  2. Mention the group and the period of these elements in the Modern Periodic Table.
  3. Classify these elements as metals, non-metals or metalloids
  4. How many valence electrons are present in each one of them?

List the features of Mendeleev’s Periodic Table.


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