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प्रश्न
Select the correct answer to the statement given below:
An element present in the earth’s crust, atmosphere and the human body.
विकल्प
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
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उत्तर
Oxygen
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संबंधित प्रश्न
Give two symbols which have been derived from the "English names" of the elements.
The Latin language name of an element is natrium. The English name of this element is :
Why is the symbol S for sulphur, but Na for sodium and Si for silicon?
Fill in the blank:
Symbolic expression for a molecule is called _____.
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.
Helium by ‘He’
For writing a chemical formula – ‘symbols’ and combining capacity of an element with hydrogen i.e. ‘valency’ should be known. Explain the term – combining the capacity of an element i.e. valency.
Give the symbol of the following element:
Carbon
Write the chemical formula of the following:
aluminium chloride
What does the symbol '⇌' present in a chemical equation, mean?
How many elements are known at present?
