In general, On moving from left to right across a period ionization potential of elements in periodic table :
A
increases
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B
decreases
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C
constant
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D
none of these
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Solution
The correct option is A increases The ionization energy, or ionization potential, is the energy required to completely remove an electron from a gaseous atom or ion. Ionization energies increase moving from left to right across a period (decreasing atomic radius). Ionization energy decreases moving down a group (increasing atomic radius).