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(a) What is an atom? How do atoms usually exist?(b) What is a molecule? Explain with an example.(c) What is the difference between the molecule of an element and the molecule of a compound? Give one example of each.
(a) An atom is the smallest particle of an element that can take part in a chemical reaction. They usually exist in combination with the atoms of the same element or another element.
(b) A molecule is an electrically neutral group of two or more atoms chemically bonded together.
Example: Ozone gas has three oxygen atoms combined together, so ozone exists in the form of an O3 molecule.
(c)
Molecule of an element | Molecule of a compound |
The molecule of an element contains two or more similar atoms chemically bonded together. | The molecule of compound contains two or more different types of atoms chemically bonded together. |
For example- A molecule of hydrogen element consists of 2 hydrogen atoms combined together. | For example- The molecule of hydrogen chloride(HCl) contains two different types of atoms, i.e. H and Cl. |
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