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IB 3.2.2.5

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The melting points of elements in group 1 decrease down the group because the atomic radius increases, resulting in weaker metallic bonds and a weaker attraction between the nucleus and delocalized electrons. The melting points given for lithium, sodium, potassium, rubidium, and cesium show this decreasing trend.

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Explaining the trend in melting points
Explaining the trend in melting points The melting points of the elements decrease down group 1.
Explaining the trend in melting points The melting points of the Melting elements decrease down Element point (K) group 1. Lithium 454 A metals melting point depends on the strength of its metallic Sodium 371 bonds. This decreases down the Potassium 336 group because the atomic radius increases, resulting in a weaker Rubidium 312 attraction between the nucleus Caesium 302 and delocalized electrons.
Explaining the trend in melting points The melting points of the Melting elements decrease down Element point (K) group 1. Lithium 454 A metals melting point depends on the strength of its metallic Sodium 371 bonds. This decreases down the Potassium 336 group because the atomic radius increases, resulting in a weaker Rubidium 312 attraction between the nucleus Caesium 302 and delocalized electrons. large radius weak attraction Small radius Strong attraction
Trend in Mp of halogens? The halogens are the elements in Group 7 of the periodic table.
Trend in Mp of halogens? The halogens are the elements in Group 7 of the periodic table.
Trend in Mp of halogens? The halogens are the elements in Group 7 of the periodic table. The name halogen comes from the Greek words for salt-making.
Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points.
Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points. fluorine atomic radius = 42 10-12 m boiling point = -118 属C
Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points. fluorine iodine atomic radius = 42 10-12 m atomic radius = 115 10-12 m boiling point = -118 属C boiling point = 184 属C
Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points. van der Waals forces fluorine iodine atomic radius = 42 10-12 m atomic radius = 115 10-12 m boiling point = -118 属C boiling point = 184 属C

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IB 3.2.2.5

  • 1. Explaining the trend in melting points
  • 2. Explaining the trend in melting points The melting points of the elements decrease down group 1.
  • 3. Explaining the trend in melting points The melting points of the Melting elements decrease down Element point (K) group 1. Lithium 454 A metals melting point depends on the strength of its metallic Sodium 371 bonds. This decreases down the Potassium 336 group because the atomic radius increases, resulting in a weaker Rubidium 312 attraction between the nucleus Caesium 302 and delocalized electrons.
  • 4. Explaining the trend in melting points The melting points of the Melting elements decrease down Element point (K) group 1. Lithium 454 A metals melting point depends on the strength of its metallic Sodium 371 bonds. This decreases down the Potassium 336 group because the atomic radius increases, resulting in a weaker Rubidium 312 attraction between the nucleus Caesium 302 and delocalized electrons. large radius weak attraction Small radius Strong attraction
  • 5. Trend in Mp of halogens? The halogens are the elements in Group 7 of the periodic table.
  • 6. Trend in Mp of halogens? The halogens are the elements in Group 7 of the periodic table.
  • 7. Trend in Mp of halogens? The halogens are the elements in Group 7 of the periodic table. The name halogen comes from the Greek words for salt-making.
  • 8. Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points.
  • 9. Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points. fluorine atomic radius = 42 10-12 m boiling point = -118 属C
  • 10. Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points. fluorine iodine atomic radius = 42 10-12 m atomic radius = 115 10-12 m boiling point = -118 属C boiling point = 184 属C
  • 11. Trends in boiling point Halogen molecules increase in size down the group. This leads to greater van der Waals forces between molecules, increasing the energy needed to separate the molecules and therefore higher melting and boiling points. van der Waals forces fluorine iodine atomic radius = 42 10-12 m atomic radius = 115 10-12 m boiling point = -118 属C boiling point = 184 属C