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प्रश्न
Compare Modern Periodic Law with Mendeleev's Periodic Law.
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उत्तर
Modern Periodic Law:
- Basis is “properties of elements depend on electronic configuration.” Elements are arranged in increasing atomic number.
Mendeleev's Periodic Law:
- Basis is “properties of elements are a periodic function of atomic mass.”
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संबंधित प्रश्न
On the basis of electronic configuration, how will you identify the first element of a period?
Name two elements in Alkali metals.
Give the symbol and valency of the following element and radical.
Hydrogen
Give the chemical formula of sodium sulphite
State the number of elements in Period 3 of the Periodic Table.
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
On moving from left to right in a period in the periodic table, the size of the atom ______
Which one of the following elements exhibit maximum number of valence electrons?
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
