Molecules
A molecule is an electrically neutral group of two (or more) atoms chemically bonded together.The forces which hold the atoms together in a molecule are called covalent bonds.Thus, a combination of atoms is called a molecule.We know that atoms of most of the elements are very reactive and cannot exist in the free state (as single atoms).This is not so with molecules.Molecules can exist in free state because they are very stable.This gives us another definition of molecule which can be written as follows:A molecule is the smallest particle of a substance (element or compound) which has the properties of that substance and can exist in the free state.
Molecules can be formed either by the combination of atoms of the 'same element' or of 'different elements'.Depending on this, there are two types of molecules : molecules of elements,and molecules of compounds.This is discussed below.
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Atoms and Molecules - Notes
2. Monovalent Cations (Cations Having a Valency of 1+)
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3. Divalent Cations (Cations Having a Valency of 2+)
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4. Trivalent Cations (Cations Having a Valency of 3+)
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6. an example, let us give the significance of symbol C
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7. Formulae of Some Molecular Compounds
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9. Explanation of the Law of Conservation of Mass
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10. Molecular Formulae of Some Common Elements
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11. 2. A Negatively Charged Ion is Known as Anion
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13. As an example, let us give the significance of the formula H
2O
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14. Simple Ions and Compound Ions (Polyatomic Ions)
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21. Gram Atomic Mass And Gram Molecular Mass
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28. 1. A Positively Charged Ion is Known as Cation
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34. Divalent Anions (Anions Having a Valency of 2-)
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35. Molecular Masses of Some Common Elements
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37. Explanation of the Law of Constant Proportions
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39. Significance of the Formula of a Substance
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42. Symbols Derived from Latin Names of the Elements
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45. Valencies of Some Common Metal Elements Valencies of Some Common Non-Metal Elements
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46. Atomic Masses of Some Common Elements
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47. Writing Of Formulae Of Molecular Compounds
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50. Writing Of Formulae Of Ionic Compounds
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