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प्रश्न
Answer the following question:
Name two elements having a single electron in their outermost shell.
उत्तर
Hydrogen and sodium are two elements that have a single electron in their outermost shell.
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संबंधित प्रश्न
What are the main features of Mendeleev’s periodic table?
Name two elements that have two electrons in their 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?
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?
Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as
State any three demerits of Mendeleev’s periodic table.
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.
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.
Write the merits of Mendeleev’s periodic table.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
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?
State the contributions made by Mendeleev towards the periodic table.
What were the defects and anomalies in Mendeleeff's Periodic Table and how are they resolved by Moseley?
According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.
Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?
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?
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
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 ______
According to Mendeléev's Periodic Law, the elements were arranged in the periodic table in the order of
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.
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”?
State Mendeleev’s Law of Periodicity.
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?
