5 Questions around this concept.
Which of the following property displays progressive increase with the rise in atomic number across a period in the periodic table
General Trends of Some Properties in the periodic table
The general trends of some properties of elements in the periodic table are mentioned below:
|
Property |
Variation from top to bottom in a group |
Variation from left to right in a period |
|
Atomic radius |
Increases |
Decreases |
|
Ionisation enthalpy |
Decreases |
Increases |
|
Electron gain enthalpy |
Decreases |
Increases |
|
Electronegativity |
Decreases |
Increases |
|
Metallic character |
Increases |
Decreases |
|
Electropositive nature |
Increases |
Decreases |
|
Oxidising nature |
Decreases |
Increases |
|
Reducing nature |
Increases |
Decreases |
Some important facts about elements
There are some important facts about the elements as mentioned below:
Bromine is the only non-metal which is liquid at room temperature.
Mercury is the only metal that is liquid at room temperature.
Tungsten has the highest melting point among metals around 3410oC.
Carbon has the highest melting point among non-metals around 4100oC.
Among metals, aluminium is the most abundant metal.
Among all the elements in the periodic table, hydrogen is the most abundant element in the universe.
Iron is the most abundant transition metal.
Boron has the lowest atomic volume.
Francium has the highest atomic volume.
Silver is the best conductor of electricity.
Fluorine is the most electronegative element.
Chlorine has the maximum negative electron gain enthalpy.
Helium has the maximum ionisation enthalpy.
Diamond is the hardest substance in the universe.
Plutonium is the most poisonous metal.
The members of the actinide series are radioactive and most of them are not found in nature.
Tin is the element that has the maximum number of isotopes i.e, 10 isotopes.
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