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प्रश्न
State Mendeleev's periodic law.
उत्तर
Mendeleev's periodic law: “The physical and chemical properties of all the elements are a periodic function of their atomic masses.”
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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.
Name three elements that have a single electron 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?
On what basis elements are arranged in periodi table now?
On what basis did mandeleev arrange the elements in his periodic table?
State whether the following statement is true of false:
According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic numbers.
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
What chemical properties of elements were used by Mendeleev in creating his periodic table?
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 the merits of Mendeleev’s periodic table.
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.
How many elements were known at the time of Mendeleev's classification of elements?
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?
How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?
State the contributions made by Mendeleev towards the periodic table.
According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.
At the time of Mendeleev _______ elements were known.
In Mendeleev’s periodic table eka- silicon was later named as _______.
Beryllium : alkaline earth metal : : sodium: _______
According to Mendeleev’s periodic law properties of elements are ______.
State Mendeleev’s Periodic Law.
What challenges did Mendeleev face in following periodic law?
What are the limitations of Mendeleev's periodic table?
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 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
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.
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.
Properties of the elements are given below. Where would you locate the following elements in the periodic table?
- A soft metal stored under kerosene
- An element with variable (more than one) valency stored under water.
- An element which is tetravalent and forms the basis of organic chemistry
- An element which is an inert gas with atomic number 2
- An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “ anodising”
Give an account of the process adopted by Mendeléev for the classification of elements. How did he arrive at “Periodic Law”?
