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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
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
Name the metals in the first twenty elements.
Write a short note.
Structure of the modern periodic table.
State the number of elements in Period 3 of the Periodic Table.
An element which is an essential constituent of all organic compounds belongs to
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
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
Name the metalloids in the first twenty elements.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
