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Atomic size of the elements increases as it goes down the group because an additional shell is added to each element.
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Solubility, heat and electricity conductivity: Cannot dissolve in water and cannot conduct electricity and heat. |
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Melting and boiling point
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Under room conditions, they are colourless gases with low melting and boiling point. |
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Very little heat is required to overcome the weak van der Waal’s forces present between the atoms of the gases. |
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Low density because the atoms are very far apart. |
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The animation below shows the changes in physical properties of Group 18 elements down the group.
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