Download Agenda 11/7/2016 9:15

Agenda 11/7/2016 9:15 - 10:25
Slip Quiz
Trends in Properties in the Periodic table explaining the patterns (notes from slides)
Demonstration: Flame tests
Additional Review Questions for test
Homework
Slip Quiz 1
Which of the following has 8 valence
electrons? Explain how you decided.
antimony, aluminum, argon, arsenic.
2. Which 2 elements in the list would have
the same number of valence electrons?
How many? How do you know?
Correct your answers
Which of the following has 8 valence
electrons? Explain how you decided.
antimony, aluminum, argon, arsenic.
Argon has 8 valence electrons - group 18
2
2
6
2
6
2
6
1s 2s 2p 3s 3p
[Ne]3s 3p
8 electrons in outermost energy level orbitals
antimony, aluminum, argon, arsenic.
Antimony and arsenic are in the same group
(Grp 15) in the Periodic table and all
elements in a group have same number of
valence electrons.
As electron config. [Ar]3d104s24p3
5 valence electrons
This 2D model is useful for thinking
about the size of atoms and how
they might change along periods and
down groups in the periodic table
e-e(showing electrons in
Energy levels, increasing
ee- e- 11+ eeeIn energy as the levels
ee- eIncrease in size).
Atomic radius vs. Atomic Number (take notes under graph)
Generally Atomic radius increases down a
group
Generally Atomic radius increases down a
group
Generally Atomic radius increases down a
group
Generally Atomic radius decreases across
a period
Generally Atomic radius decreases across
a period
Generally Atomic radius decreases across
a period
Note on atomic radius - measuring it
Atomic radius vs. ionic radius
An ion is an atom or bonded group of atoms
that has a positive or negative charge.
Atomic
radius
e- 11+ eeLarger
ee- eee- ethan
e-e-
Ionic
radius
Sodium atom
Sodium ion Na+
Electrically neutral
11+ - 10- = +1 charge
Periodic Variation in Chemical Properties
Ionization energy
Periodic Variation in Chemical Properties
p 167
Generally ionization energy _______ down
a group
p 167
p 167
p 167
Generally ionization energy decreases
down a group
Generally ionization energy ____________
across a period
p 167
Generally ionization energy increases
across a period
The Octet Rule
Atoms tend to gain, lose or share electrons in
order to acquire a full set of eight valence
electrons.
Electron configurations like those of the Noble gases
with filled s and p orbitals of the same energy level are
unusually stable. (Note that Helium has only 2 valence
electrons, but that is because the 1st energy level can
only accommodate 2 electrons in its 1s orbital.)
The Octet Rule
Electron configurations like those of the Noble gases
with filled s and p orbitals of the same energy level are
unusually stable. (Note that Helium has only 2 valence
electrons, but that is because the 1st energy level can
only accommodate 2 electrons in its 1s orbital.)
Useful for determining the type of ions that elements
are likely to form.
Keep the IUPAC announcement safe for
now.
115
Ds
Rg
Cn
Nh
Fl
Mc
116
Lv
117
118
Ts
Og
a)
a)
a)
a)
Hund’s rule: single
electrons with the
same spin must occupy
each equal-energy
orbital before additional
electrons with opposite
spins occupy the same
orbitals.
a)
a)
a)
a)
: :
a)
b)
•
c)
•
• •
•
☉
Homework
Test is 20 multiple choice 1 pt each
5 Structured - total 65 pts (Includes
Graphing question).
Chapters 6 and 5.
Test on Wednesday, Nov 9th.