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प्रश्न
Name two elements that have two electrons in their outermost shells.
उत्तर
(b) Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells.
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संबंधित प्रश्न
What are the main features of Mendeleev’s periodic table?
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
State the contributions made by Mendeleev towards the periodic table.
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
State Mendeleev’s Periodic Law.
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
Which of the following oxide is most basic?
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.
