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प्रश्न
The scientist who propounded the modern periodic law is ______.
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उत्तर
The scientist who propounded the modern periodic law is Dimitri Mendeleev.
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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−
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Fill in the following blank with suitable word:
Group 18 elements are called ...............
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
What is a period in a periodic table?
Name two elements in Inert gas.
Name two elements in each case:
Transition element
To the left of the zig-zag line in the periodic table are the metal elements.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
E and B
