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प्रश्न
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
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उत्तर
The following rules are followed while assigning symbol to an elements:
- Chemical symbols usually consist of one or two letters.
- The symbols of most elements correspond to the first letter (which is capitalized) of their English name. For example, the symbol for oxygen is “O” and that for hydrogen is “H”.
- When there is more than one element that begins with the same letter, their symbols take two letters.
- The first letter is capitalised while the second letter has a lower case.
- For example, the names of both hydrogen and helium begin with H. So, hydrogen is represented by the symbol H and Helium by He.
| Element | Symbol |
| Hydrogen | H |
| Fluorine | F |
| Aluminimum | Al |
| Argon | Ar |
| Phosphorus | P |
| Sulphur | S |
| Chromium | CrCo |
| Cobalt |
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संबंधित प्रश्न
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Magnetic separation
What do the following symbol stand for?
H2
Fill in the blank:
Dalton used symbol _____ for oxygen and _____ for hydrogen.
Match the symbols of – radicals – with their correct combining power or capacity, (valency).
(a) OH
(b) So4
(c) No3
(d) Co3
Combining power or capacity – A : 3; B : 2; C : 1. (negative valencies)
State which element exists in the highest percentage in earth’s crust.
State the type of element for the following:
potassium
Give the symbol of the following element:
Sodium
State the type of element for the following:
Phosphorus
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Plumbite
Mass of one atom of oxygen is
