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Ionisation Energy
Defined as the energy required to remove the most loosely held electron from one mole of gaseous
atoms to produce one mole of gaseous ions each with a single positive ion.

1 Mole: 6.0023 x 10 to the power of 23

Formula: X (g) -------------> X + (g)…

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From B (1s22s22p1) to N (1s22s22p3) the proton number increases, but the number of electrons
shielding the nuclear charge remains the same at 4. Thus the effective nuclear charge increases from
B to N and the electrons become progressively harder to remove.

The first ionisation energy thus increases from B…

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