Question

The first ionisation energy of sodium is 500 kJ mol–1. This denotes the energy 1) Given out when 1 mole of sodium atoms dissolve in water to form sodium ions 2) Required to remove one electron to infinity from one atom of sodium 3) Required to raise the electron in one mole of gaseous sodium atoms to a higher energy level 4) Required to change one mole of gaseous sodium atoms into gaseous ion (Na+)

Answer 1

option 4) required to change one mole of gaseous sodium atoms into gaseous ions

The amount of energy required to remove one mole of electrons from one mole of gaseous atoms of an element to form one mole of gaseous ions is called the Ionization energy of an element

• The first ionization energy of sodium is the minimum energy required to remove one electron from 1 mole of a neutral sodium atom.
• The first ionization energy of sodium is less than the second ionization energy of sodium.
• Ionization energy generally increases, when moving from left to right in the periodic table.
• Ionization energy generally decreases, when moving from top to bottom in the periodic table.
• The units of ionization energy are kilojoules per mole (KJ/mol) or electron volts (eV).
• Ionization energy exhibits periodicity on the periodic table

Hence, The first ionization energy of sodium is 500 kJ mol–1. This denotes the energy required to change one mole of gaseous sodium atoms into gaseous ions.

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