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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
Give two symbols which have been derived from the "English names" of the elements.
What is the significance of the symbol of an element ? Explain with the help of an example.
The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be :
Give two examples of the following:
Liquid + Liquid mixture:
Match the symbols of non-metallic elements with their correct combining power or capacity.
(a) O
(b) S
(c) Cl
Combining power or capacity A : 3; B : 2; C : 1. (negative valencies)
Give the symbol of the following element:
Phosphate
Write the radical of the following valency:
Calcium
Write the chemical formula of the following:
Sodium bromide
State the valency of the following metallic element and write symbol with the valency
Sodium
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).
Aluminate
