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प्रश्न
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
पर्याय
(i) only
(i), (ii) and (iii)
(i), (ii) and (iv)
(iv) only
उत्तर
(i), (ii) and (iii)
Explanation -
The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number and not on the basis of their increasing atomic masses. Also, the Isotopes are not placed in the adjoining group (s) in the Periodic Table.
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संबंधित प्रश्न
Name two elements that have two electrons in their outermost shells.
State whether the following statement is true of false:
According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic numbers.
(a) Write its electronic configuration and determine its valency.
(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.
(c) Is it a metal or a non-metal?
(d) Write the formula of its oxide.
Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.
Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
On which basis Mendeleev organised periodic law?
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
