Which of the following statements about monosaccharide structure is true?
a) aldoses and ketoses differ in the position of their hydroxyl groups.
b) monosaccharides can be classified according to the spatial arrangement of their atoms.
c) all monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.
d) a six-carbon sugar is called a pentose.

The correct answer is B.

Explanation:

In stereoisomers, isomers differ in the orientation or spatial arrangement of their atoms.

The bonds of carbon atoms are three-dimensional geometry, their bonds can rotate in such a way that they offer a multitude of alternative positions. This allows the existence of the different stereoisomers of monosaccharides.

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ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.