Electron affinity: The enthalpy change that results from adding an electron to a gaseous atom.

Electron affinity is becoming less negative (less exothermic) and less likely to gain an electron. 

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#Section 2: General Biology

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Glycine at pH 2.34, where there is an equal mixture of

  the average or net positive charge is 0.5 or +1/2

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#Section 2: General Biology

His ionisation series

1------pK1-----pKr--------pKr------14

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Lys & Arg have ionisation series

1------pK1-----pK2--------pKr------14

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Lys & Arg have four ionisations zones

1. 1--------pK1 – charge +2

2. pK1---------pK2 charge +1

3. pK2---------pKr charge 0

4. pKr---------14 charge -1

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#Section 2: General Biology

Negatively charged amino acids have four ionisations zones

1. 1--------pK1 – charge +1

2. pK1---------pKr charge 0

3. pKr---------pK2 charge -1

4. pK2---------14 charge -2