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प्रश्न
An element A forms an oxide A2O5.
What is the valency of element A ?
उत्तर
Element A forms an oxide A2O5. Crossing the valencies, we can see that the valency of O (oxide) is −2 and that of element A is 5.
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संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
K2SO4
State the term.
The number of atoms present in a molecule of an element _________
Define: Atomic number
Define: Atomic weight :
What is the atomicity of the following ?
- Oxygen
- Ozone
- Neon
- Sulphur
- Phosphorus
- Sodium
In what form does oxygen gas occur in nature ?
In what form do noble gases occur in nature?
What is the difference between the molecule of an element and the molecule of a compound ? Give one
example of each.
Classify the following molecules as the molecules of element or compound
| 1. |  |
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| 2. |  |
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| 3. |  |
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| 4. |  |
Two elements sometimes can form more than one compound.
