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प्रश्न
Fill in the blank:
Dalton used symbol _____ for oxygen and _____ for hydrogen.
उत्तर
Dalton used symbol [⚪] for oxygen and [☉] for hydrogen.
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संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Define atomic mass unit. What is its symbol ?
What do the following symbol stand for?
H2
The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Phosphate
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 |
Give three reasons why – carbon dioxide is considered a compound, while carbon – an element.
Give the formula of the following acid:
Sulphuric
State the valency of the following metallic element and write symbol with the valency
Aluminium
Name three metals whose symbols are derived from the first letter of the name of the element.
Which of the following symbols of elements are incorrect? Give their correct symbols
- Cobalt CO
- Carbon c
- Aluminium AL
- Helium He
- Sodium So
