How are ionic bonds formed in the hair?

The -COOH group lost a hydrogen ion to become -COO with a charge of 1- and the -NH2 has gained a hydrogen ion becoming NH3 positive. The attraction between these ions forms an ionic bond. Hydrogen bonds form attractions within protein molecules and also between different molecules within the hair.

Explanation:

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the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.