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प्रश्न
What do you understand by :
Noble gases
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उत्तर
Noble gases : Noble gases are those which do not react chemically with other elements or compounds e.g. helium, neon, etc.
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संबंधित प्रश्न
An atom of an element is denoted by a “symbol”. Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Hydrogen by ‘H’
Match the symbols of metallic elements – with their correct combining power or capacity.
(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)
State the type of element for the following:
Xenon
Give the symbol of the following element:
Sulphite
Give the symbol of the following element:
Phosphate
Write the radical of the following valency:
Sulphite
Write the chemical formula of the following:
aluminium chloride
Write the symbols for the following elements.
- Oxygen
- Gold
- Calcium
- Cadmium
- Iron
The chemical symbol for sodium is
What is the significance of the symbol of an element?
