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प्रश्न
Write the names from the description.
Two elements having valency 4.
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उत्तर
Carbon and Silicon.
संबंधित प्रश्न
Write the name from the description.
The period with electrons in the shells K, L, and M.
Write the name from the description.
The family of metals having valency one.
Write the names from the description.
The metalloids in the second and third periods.
Write the names from the description.
Non-metals in the third period.
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 –
transition elements
Write a short note on the following type of element –
inner transition 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.
d-block elements are otherwise known as ______.
If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p1’then it will
occupy ______ block of the periodic table.
What are the s-block elements?
What are the p-block elements
d-block elements are called transition elements.
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.
Assertion (A): Noble gases are chemically inert in nature.
Reason (R): Noble gases have stable electronic structures.
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]
