Advertisements
Advertisements
प्रश्न
Beryllium : alkaline earth metal : : sodium: _______
उत्तर
Beryllium : alkaline earth metal : : sodium: Alkali metal
APPEARS IN
संबंधित प्रश्न
What are the main features of Mendeleev’s periodic table?
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, Al, Si, Ba.
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 elements are arranged in periodi table now?
On what basis did mandeleev arrange the elements in his periodic table?
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?
Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.
Write a short note.
Mendeleev’s periodic law.
Write the merits of Mendeleev’s periodic table.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
What are the demerits of Mendeleev’s periodic table?
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.
What were the defects and anomalies in Mendeleeff's Periodic Table and how are they resolved by Moseley?
In Mendeleev’s periodic table eka- silicon was later named as _______.
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?
Write scientific reason.
There was no definitive place for isotope in Mendeleev’s periodic table.
State Mendeleev’s Periodic Law.
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
On which basis Mendeleev organised periodic law?
What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?
The total number of electrons present in the first twenty elements of the periodic table is ______
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.
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.
Mendeléev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
- Name the elements which have taken the place of these elements
- Mention the group and the period of these elements in the Modern Periodic Table.
- Classify these elements as metals, non-metals or metalloids
- How many valence electrons are present in each one of them?
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.
