Draw the optically active stereoisomer(s) of 1,3-cyclopentanediol.

             The three possible stereoisomers of 1,3-cyclopentanediol are as follow,

                  i) (1S,3R)-1,3-Cyclopentanediol

                  ii) (1R,3R)-1,3-Cyclopentanediol

                  iii)  (1S,3S)-1,3-Cyclopentanediol

Structures of all three compounds are attached below.

Stereoisomers: Also known as spatial isomers are those isomers which have same molecular formula and structural formula but the groups about the chiral center occupy different orientation in space.

Enantiomers: These are stereoisomers of each other which are non-identical mirror-images of each other.

Diastereomers: These are stereoisomers which are not mirror images of each other.

Meso Compounds: These are those isomers which are superimposible on its mirror image.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

b.

the accuracy of the data.