Advertisements
Advertisements
प्रश्न
What is the main characteristic of the last elements in the periods of a periodic table? What is the general name of such elements?
उत्तर
The last elements of each period have their outermost shell complete, i.e. 2 or 8 electrons. Main characteristics of the last element in each period of the Periodic Table are:
- They have valency equal to zero.
- They react under very special condition otherwise they don't react.
- They have stable gas electronic configuration.
- The general name is inert gases or noble gases.
APPEARS IN
संबंधित प्रश्न
Write the name from the description.
The family of metals having valency two.
Write the name from the description.
The metalloids in the second and third periods.
Write the name from the description.
Two elements having valency 4.
Match column A with column B.
|
Column A |
Column B |
|
(a) Element short by 1 electron in octet |
(i) Transition elements |
|
(b) Highly reactive metals |
(ii) Noble gases |
|
(c) Non-reactive elements |
(iii) Alkali metals |
|
(d) Elements of groups 3 to 12 |
(iv) Alkaline earth metals |
|
(e) Radioactive elements |
(v) Halogens |
|
(f) Elements with 2 electrons in the outermost orbit |
(vi)Actinides |
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.
Statement: Elements in a group generally possess similar properties but elements along a period have different properties.
Reason: The difference in electronic configuration makes the element differ in their chemical properties along a period.
What are the s-block 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.
Answer the following questions related to the modern periodic table.
Name the blocks with the groups that they consist of.
Answer the following questions related to the modern periodic table.
Which block elements are known as transition elements?
