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प्रश्न
In Mendeleev’s periodic table eka- silicon was later named as _______.
पर्याय
scandium
gallium
germanium
thorium
उत्तर
In Mendeleev’s periodic table eka- silicon was later named as germanium.
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संबंधित प्रश्न
Name three elements that have a single electron in their outermost shells.
Name three elements with filled outermost shells.
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?
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.
(a) Write its electronic configuration and determine its valency.
(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.
(c) Is it a metal or a non-metal?
(d) Write the formula of its oxide.
Write a short note.
Mendeleev’s periodic law.
Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
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.
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?
According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.
At the time of Mendeleev _______ elements were known.
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 ______.
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
Write scientific reason.
Mendeleev kept vacant places in the periodic table.
Write scientific reason.
There was no definitive place for isotope in Mendeleev’s periodic table.
State Mendeleev’s 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 ______
The total number of electrons present in the first twenty elements of the periodic table is ______
Eka-aluminium and Eka-silicon are known as ______
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”?
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?
