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प्रश्न
How do alkaline earth metals occur in nature?
उत्तर
Alkaline earth metals occur in nature in the combined state and not in the free state as they are very reactive.
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संबंधित प्रश्न
What is meant in the periodic table by a group?
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
Write the electronic configuration of the first two alkaline earth metals.
Give reason:
Alkali metals and halogens do not occur free in nature.
Write a short note on the following type of element –
alkaline earth metals
Write a short note on the following type of element –
noble gases
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.
State the following:
The group which contains highly reactive electronegative non-metals including chlorine.
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 |
