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प्रश्न
Match the noble gases – with their correct symbols:
| Noble gases | Symbols |
| (a) Helium | (1) Ar |
| (b) Neon | (2) Xe |
| (c) Argon | (3) Rn |
| (d) Krypton | (4) He |
| (e) Xenon | (5) Kr |
| (f) Radon | (6) Ne |
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उत्तर
| Noble gases | Symbols |
| (a) Helium | He |
| (b) Neon | Ne |
| (c) Argon | Ar |
| (d) Krypton | Kr |
| (e) Xenon | Xe |
| (f) Radon | Rn |
संबंधित प्रश्न
The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
Give the names and symbols of the first twenty elements of the periodic table.
For writing a chemical formula – ‘symbols’ and combining capacity of an element with hydrogen i.e. ‘valency’ should be known. Explain the term – combining the capacity of an element i.e. valency.
State which element exists in the highest percentage in earth’s crust.
State the type of element for the following:
Xenon
Give the formula of the following acid:
Sulphuric
Define the term ‘valency’.
What does the symbol '→' present in a chemical equation, mean?
Write the symbols for the following elements.
- Oxygen
- Gold
- Calcium
- Cadmium
- Iron
What is the rarest natural element on the earth?
