Advertisements
Advertisements
प्रश्न
Give reason:
Alkali metals and halogens do not occur free in nature.
Advertisements
उत्तर
Alkali metals and halogens are very reactive; hence, they do not occur in the free state in nature.
APPEARS IN
संबंधित प्रश्न
Name two elements of each group.
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas with duplet arrangement of electrons.
Write the reactions of the first three alkaline earth metals with dilute hydrochloric acid.
Write the electronic configuration of the first two alkaline earth metals.
Write a short note on the following type of element –
alkali metals
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.
State the following:
The group from the groups 1 [IA], 2 [IIA], 16 [VIA] and 7 [VIIA] whose elements are most electronegative.
State the following:
The group whose elements are unreactive or inert.
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 |
