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प्रश्न
Complete the following crossword puzzle (Fig. 3.1) by using the name of the chemical elements. Use the data given in Table.
| Across | Down | ||
| 2 | The element used by Rutherford during his α–scattering experiment | 1 | A white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air |
| 3 | An element which forms rust on exposure to moist air | 4 | Both brass and bronze are alloys of the element |
| 5 | A very reactive non–metal stored under water | 6 | The metal which exists in the liquid state at room temperature |
| 6 | Zinc metal when treated with dilute hydrochloric acid produces a gas of this element which when tested with burning splinter produces a pop sound. | 8 | An element with symbol Pb |

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उत्तर

| Across | Down | ||
| 2 | Gold | 1 | Silver |
| 3 | Iron | 4 | Copper |
| 5 | Phosphorus | 6 | Mercury |
| 7 | Hydrogen | 8 | Lead |
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संबंधित प्रश्न
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
Give the empirical formula of Glucose C6H12O6 .
Write the formula of the following compound:
Zinc chloride
Write the formula of the following compound:
Zinc nitrate
Write the formula of the following compound:
Zinc sulphate
Write the formula of the following compound:
Aluminium nitrate
Write the formula of the following compound:
Copper [I] chloride
Write the formula of the following compound:
Iron [II] chloride
Play a game for writing formula.
Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
For example:

The formula for sodium sulphate:
2 sodium ions can be fixed on one sulphate ion.
Hence, the formula will be Na2SO4.
Do it yourself:
Now, write the formula of sodium phosphate.
