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प्रश्न
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
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उत्तर
‘An atom is the basic unit of an element’.
An atom of fluorine [At. No. 9]
\[\ce{\underset{\text{[atomic no.]}}{Z} = \underset{\text{[no. of protons]}}{P} = \underset{\text{[no. of electrons]}}{e}}\]
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संबंधित प्रश्न
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
What is the difference between a pure substance and a mixture ?
Give Two Examples for Each of the Following: Non-metals
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
Name: a Metal Which is a Poor Conductor of Electricity.
Name: Three different forms of carbon
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.
Explain the difference between Atoms and molecules.
Explain the term ‘mixture’.
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
