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प्रश्न
Define Elements.
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उत्तर
Elements: An element is defined as a pure substance made up of only one kind of atoms that cannot be converted into anything simpler than itself by any physical or chemical process.
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संबंधित प्रश्न
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Define: Compounds
Indicate whether the following statement is true or false:
All elements are artificially prepared
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
Write the names of elements from the following symbol:
Fe
Explain the difference between Atoms and molecules.
Select the correct answer to the statement given below:
A metalloid
Select the correct answer from the choice given below to complete the sentence :
Dust in air is an example of _________ mixture.
Name the two elements which are derived from the country.
