Advertisements
Advertisements
प्रश्न
Write the name from the description.
The family of metals having valency one.
Advertisements
उत्तर
The family of metals having valency one = Alkali metals
APPEARS IN
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.
Nonmetals in the third period.
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 |
Write a short note on the following type of element –
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.
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.
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.
______ block element is placed at the bottom of the periodic table.
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.
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]
Match the columns:
| Column ‘A’ | Column ‘B’ |
| Manganese | (a) Metal |
| (b) Non-metal | |
| (c) Transition metal |
