6.) A purification was performed to separate a mixture of fluorene and fluorenone using normal phase chromatography. The objective is to isolate a pure sample of each component. There are
three fractions that were isolated from the separation. Answer the following questions based
on the results of the separation:
Fluorene
non-Paar
Fluorenone
Fluorene
Fluorenone
Fr 1
Fr 2
Fr3
6a.) What component is present in fraction 1 (Fr 1)?
6b.) What component is present in fraction 2 (Fr2)?
6c.) What component is present in fraction 3 (Fr3)?

can you attach a picture of the lettuce? : )

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.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

c

explanation: