1s 2s 2p 1s 2s 2p F (9 electrons)

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are first half-filled before they are totally filled. F (9 electrons). 1s. 2s 2p. 3s 3p 3d. 4s 4p 4d 4f. 5s 5p 5d 5f 5g.
CONCEPT: ELECTRON CONFIGURATIONS In this chapter we will focus on how an element’s ________________________________________ - the distribution of electrons within the orbitals of its atoms – relates to its chemical and physical properties. History Lesson: In 1870, Dmitri Mendeleev arranged 65 elements into a ___________________________________ . •

He summarized their behavior in the _______________________________.



When arranged by atomic mass, the elements exhibit a periodic recurrence of similar properties.

The Electron Configuration According to the _______________ Principle you first have to totally fill in the lowest energy level before moving to the next.

1s

2p

2s

1s 2s$$$$$$2p 3s$$$$$$3p$$$$$$3d 4s$$$$$$4p$$$$$$4d$$$$$4f 5s$$$$$$5p$$$$$$5d$$$$$5f$$$$$5g 6s$$$$$$6p$$$$$$6d$$$$$6f$$$$$6g$$$$6h$ 7s$$$$$$7p$$$$$$7d$$$$$7f$$$$$7g$$$$7h

 

F (9 electrons)

1s

2s

2p

Hund’s Rule states that electron orbitals that are _______________________ are first half-filled before they are totally filled.