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Sparks

CH301

ELECTRONS and BONDING WRAP

UNIT 2 Day 9

Important Information

EXAM THURSDAY 7PM – 9PM

QUIZ: CLICKER QUESTION

Which of the of following is the electronic configuration for K and K+ , respectively? a)1s22s22p63s23p64s1 ; 1s22s22p63s23p64s1

a)1s22s22p63s23p64s1 ; 1s12s22p63s23p64s1

a)1s22s22p63s23p64s1 ; 1s22s22p63s23p6

a)1s22s22p63s23p64s1 ; 1s22s22p63s23p64s2

Relate electron configuration to periodic table

QUIZ: CLICKER QUESTION

A laser pulse shines for 10 s delivering a total energy of 4 mJ of 633 nm light. Another laser delivers the same amount of energy with a wavelength of 408 nm. Which laser is delivering more photons to the sample? A) RED Laser B) BLUE Laser C) BOTH ARE THE SAME D) NOT ENOUGH INFORMATION

QUIZ: CLICKER QUESTION

Each of these lasers shines on calcium ( = 2.90 eV). What will happen when a 10 s pulse of red laser shines on calcium? a) NOTHING b) Electrons will be ejected c) Electrons will be ejected, but fewer than for the

blue laser What will happen when a 10 s pulse of the blue laser shines on calcium? a) NOTHING b) Electrons will be ejected c) Electrons will be ejected, but there will be fewer

than for the red laser

2. Please explain the change in effective nuclear charge, Zeff , as you move across a row in the periodic table from left to right. Indicate how this change in Zeff affects the ionization energy and the atomic radii of the atoms as you move across a row. Use the elements calcium and selenium as specific examples predicting which would have the smaller atomic nucleus and why.

EXPLANATION SPACE

QUIZ: CLICKER QUESTION

Please write out the electron configuration for Germanium, Ge,

using the noble gas short hand method

a) [Ar]3s23p64s23d104p2 b) [Ar] 4s24p2

c) [Ar] 4s23d104p2

d) [Kr] 4s23d104p2

e) [Kr] 4s24p4

QUIZ: CLICKER QUESTION

Given that the correct electron configuration for Germanium, Ge is: [Ar] 4s23d104p2

Which of the following sets of quantum numbers will not be

an allowed set for an electron in the ground state of Ge? a) 1,0,0,½ b) 4,1,0,½ c) 3,1,1,½ d) 4,2,-2,½ e) 4,1,-1,-½

QUIZ: CLICKER QUESTION

Please draw the Lewis structure for the molecule, oxalate ion, C2O4

2-.

The formal charge for each atom in the structure is correct in which diagram?

QUIZ: CLICKER QUESTION

The concept of electronegativity refers to:

a)The notion that metals tend to lose electrons to form cations.

b)The notion that nonmetals have a greater affinity for electrons, so will tend to form anions to achieve a noble gas type electron configuration.

c)The notion that within the context of a covalent bond, an atom which has a stronger affinity for electrons will attract the shared pair to a greater extent.

d)The notion that covalent compounds share their bonding pairs electrons equally between atoms producing pure covalent or non polar type bonds.

CH302 Vanden Bout/LaBrake Fall 2012

What have we learned?

Electromagnetic radiation interacts with matter.

Understanding EM radiation, helps to understand matter on

the micro-scale. The physical model of the behavior of teeny

tiny things is quite complicated and difficult to understand.

The number of protons and the number and arrangement of

electrons is important for predicting the chemical

properties of the elements. You can abbreviate complicated

electron configurations using a series of numbers and letters.

The periodic table is your friend.

You can name compounds. You can understand the structure

of ionic compounds. You can predict basic bonding in

molecules using Lewis structures.