Advertisements
Advertisements
प्रश्न
Give reason:
Alkali metals and halogens do not occur free in nature.
उत्तर
Alkali metals and halogens are very reactive; hence, they do not occur in the free state in nature.
APPEARS IN
संबंधित प्रश्न
What are the following group known as?
Group 18
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
State the characteristics which remain similar in moving down in a group of the periodic table.
Write a short note on the following type of element –
alkali metals
Write a short note on the following type of element –
halogens
‘The periodic table contains elements methodically grouped together’.
State the main helpful features of the long form of the periodic table.
Name or state following with reference to the element of the first three periods of the periodic table.
An alkaline earth metal in period 3.
Select the correct answer from the options given below.
The most reactive halogen from group 17.
Match the elements of List – I with their type from List – II.
| List – I | List – II |
| 1. Highly reactive, univalent metals | A: Halogens |
| 2. Highly reactive, univalent non-metals | B: Transition elements |
| 3. Unreactive, inert elements | C: Alkali metals |
| 4. Elements of group 3 to 12 [IB to VII B and VIII] | D: Lanthanide series |
| 5. Radioactive elements | E: Noble gases |
| F: Actinide series |
