Advertisements
Advertisements
प्रश्न
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
उत्तर
Noble gases could be placed in Mendeléev's Periodic Table without disturbing the original order.
According to Mendeleev’s classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties.
Noble gases like helium (He), neon (Ne) and argon (Ar) have been mentioned in many a context before Mendeleev's periodic table was discovered. These gases were discovered very late because they are very inert and present in extremely low concentrations in our atmosphere. One of the strengths of Mendeléev’s periodic table was that, when the noble gases were discovered, they could be placed in a new group named zero group after the 8th group without disturbing the existing order.
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.
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
State Mendeleev's periodic law.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
What are the demerits of Mendeleev’s periodic table?
State the contributions made by Mendeleev towards the periodic table.
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
Which of the following properties does not match the element of the halogen family?
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”?
