Valence shell electron pair repulsion or vsepr theory states that the geometry of a molecule or polyatomic ion is determined by the repulsion of pairs of electrons associated with a central atom. the pairs of electrons may be bonding or non-bonding (lone-pair) electrons. only valence electrons of the central atom influence the molecular shape. all but one assumption listed supports vsepr theory. which statement is not critical to supporting vsepr theory?

Valence electrons, which are involved in the bonding, do not solely influence the molecular shape but also the non-bonding electrons (lone pair). The repulsion between these non-bonding (lone pair) electrons also influences the position of these and neighboring atoms in space. This is why water molecule is bent at 104.45 degrees due to repulsion of the electron clouds of the oxygen atom.

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hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.