Electron configuration of all elements according to periodic table
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Electron affinity is the energy change taking place when an isolated gaseous atom accepts an electron to form a monovalent negative ion.
As we move across a period the atomic size decreases, nuclear charge increases thus the electron affinity increases while as we move along a group the atomic size increases, nuclear charge decreases thus electron affinity decreases.
As we move across a period the atomic size decreases, nuclear charge increases thus the electron affinity increases while as we move along a group the atomic size increases, nuclear charge decreases thus electron affinity decreases.
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