Advertisements
Advertisements
प्रश्न
Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?
उत्तर
Cobalt (59Co) and nickel (59Ni) show an ambiguity regarding their sequence in Mendeleev’s periodic table.
APPEARS IN
संबंधित प्रश्न
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, Al, Si, Ba.
Name two elements that have two electrons 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?
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
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
On what basis elements are arranged in periodi table now?
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.
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.
State Mendeleev's periodic law.
Use Mendeleev's Periodic Table to predict the formula of oxides of potassium, aluminum, and barium.
Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's 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?
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.
Beryllium : alkaline earth metal : : sodium: _______
According to Mendeleev’s periodic law properties of elements are ______.
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.
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?
What are the limitations of Mendeleev's periodic table?
In Mendeleev’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?
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
Eka-aluminium and Eka-silicon are known as ______
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
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?
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
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?
