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प्रश्न
Explain the significance of the symbol H.
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उत्तर
Significance of symbol H
- The symbol H refers to the element hydrogen.
- The symbol H refers to one atom of hydrogen.
- The symbol H refers to one mole of hydrogen i.e. 6.022 × 1023 atoms.
- The symbol H refers to 1 gram atomic mass of hydrogen.
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संबंधित प्रश्न
Name the element used as a standard for atomic mass scale.
Give the names and symbols of five familiar substances which you think are elements.
Match the metallic elements – with their correct symbols Metallic elements
| Metallic elements | Symbol |
| (a) Potassium | (1) Ca |
| (b) Sodium | (2) Zn |
| (c) Calcium | (3) Pb |
| (d) Magnesium | (4) Hg |
| (e) Zinc | (5) Cu |
| (f) Aluminum | (6) Au |
| (g) Iron | (7) K |
| (h) Lead | (8) Fe |
| (i) Copper | (9) Al |
| (j) Mercury | (10) Na |
| (k) Silver | (11) Mg |
| (l) Platinum | (12) Pt |
| (m) Gold | (13) Ag |
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.
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
State the type of element for the following:
Lead
Write the radical of the following valency:
Nitrate
Write the chemical formula of the following:
calcium carbonate
What does the symbol '(l)' present in a chemical equation, mean?
Write the constituent elements and their symbols for the following compounds.
- Carbon monoxide
- Washing soda
