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प्रश्न
Write a short note on the following type of element –
transition elements
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उत्तर
d-block elements (40 elements) which are included in groups 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 [IB to VII-B and VIII] are called transition elements as most of them exhibit variable valency and are used as catalysts.
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संबंधित प्रश्न
Write the name from the description.
The period with electrons in the shells K, L, and M.
Write the names from the description.
Two elements having valency 4.
What is the main characteristic of the last elements in the periods of a periodic table? What is the general name of such elements?
Write a short note on the following type of element –
inner transition elements
Write a short note on the following type of element –
normal elements
Name or state following with reference to the element of the first three periods of the periodic table.
The periods which contain the inner transition elements.
State whether true or false. If false, correct the statement.
Group 17 elements are named as Halogens.
Assertion (A): Group 2 elements in the modem periodic table are called alkaline earth metals.
Reason (R): The oxides of group 2 elements produce alkaline solutions when they are dissolved in water.
Write the answer to the questions with reference to the periodic table.
- What do (A), (B), (C), and (D) represent? [1]
- Elements are arranged in increasing order of their ______. [1]
- Write the electronic configuration of the first four elements in Group I. [1]
- What change in atomic radius is observed in moving from left to right in a Period? [1]
- Give a reason for (d). [1]
Answer the following questions related to the modern periodic table.
How are elements placed around the zig-zag line in the p-block of the periodic table?
