There are four major methods of purification in the chemistry laboratory. which of the given techniques is not one of the four most common methods for separation and purification?

The four major methods of separation and purification techniques in the laboratory are as follows,

1. Chromatography

2. Recrystallization,

3. Distillation, and

4. Extraction

Spectroscopy however is not a common separation and purification method

Explanation:

Mass spectrometer separates ions in respect to the ratio of their mass to the their charge and are then detected based on their relative abundance this technique is used in the analysis of biomolecules

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.