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प्रश्न
What is a symbol? What information does it convey?
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उत्तर
A symbol is the short form which stands for the atom of a specific element or the abbreviations used for the names of elements.
It represents a specific element.
It represents one atom of an element.
A symbol represents how many atoms are present in its one gram (gm) atom.
It represents the number of times an atom is heavier than one atomic mass unit (amu) taken as a standard.
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संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Give two examples of the following:
Solid + Liquid mixture
Explain the terms ‘chemical formula’.
Give the symbol of the following element:
Platinum
Give the formula of the following gas:
Ammonia
Give the formula of the following gas:
Nitrogen dioxide
State the valency of the following metallic element and write symbol with the valency
Potassium
State the valency of the following metallic element and write symbol with the valency
Chromium
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).
Sulphide
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
