Review Electronic Structure

Chem I | Chem II AP
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1)
Identify the element that can have the following electronic configuration:
[Ar] 4s2 3d10 4p5
1s22s22p63s1
1s2 2s2 2p6
[Ar] 4s2 3d10
[Xe] 6s2 4f14 5d10 6p2
1s2
[Kr] 5s2 4d6
[Ne] 3s2 3p4
1s2 2s1
[Kr] 5s2 4d10 5p1
2)
Give the electronic configuration for the following elements. Indicate the number of valence electrons.
When entering an electron configuration, include spaces between each section. For example, [Ar] 4s23d104p5 would be written as: [Ar] 4s2 3d10 4p5
F
Se
Be
Sn
Ba
Rn
O
Cd
3)
Give the electron dot structure for the following elements. Indicate the number of total electrons and unpaired electrons in each.
Each checkbox represents a dot in the electron dot structure. Check the boxes on or off to indicate which dots should be used.
Mg
Mg
Sb
Sb
Br
Br
K
K
Ga
Ga
Ar
Ar
Si
Si
Se
Se
4)
Match the following electron dot notation with the appropriate group number:
5)
Give the common valence configuration for the following groups.
(Example: s2p3 for Group 15)
18
2
13
16
17
3
6)
Which groups make up the:
s block
p block
d block
f block
7)
Which sublevel(s) are present in the following energy levels?
First energy level
Second energy level
Third energy level
Fourth energy level
8)
How many d orbitals are present in the following energy levels?
First energy level

There are no d orbitals and no d sublevel in the first energy level.

Third energy level

There are no d orbitals and no d sublevel in the first energy level.

Third energy level

The third energy level contains one s orbital, 3 p orbitals and 5 d orbitals.

Fourth energy level

The fourth energy level contains one s orbital, 3 p orbitals and 5 d orbitals and 7 f orbitals.

9)
Which energy level (1, 2, 3, etc.)
Holds a maximum of eight electrons?
Contains only an s sublevel?
Holds a maximum of eighteen electrons?
10)
Which sublevel(s) are present in: (s, p, d, f)
The first energy level?
The third energy level?
The fourth energy level?
11)
How many orbitals are contained in:
a)
the first energy level
b)
the third energy level
a)
the p sublevel
c)
the s sublevel
12)
How many electrons can be placed in:
a)
the third energy level
b)
any one orbital
c)
the p sublevel
d)
a d orbital

A maximum of two electrons may be placed in any orbital.

13)
Draw and label the radiation spectrum from low energy to high energy. Label high/low frequency and long/short wavelength.
14)
According to Bohr, the more energy an electron possesses
15)
Bright lines in the spectrum of an element are caused by

Electrons give off energy in the form of light when they fall to lower energy levels.

16)
Unlike the Bohr model of the atom, the orbital (quantum mechanical) model describes an electron
Both choices b & c describe Bohr's model of the atom. The quantum mechanical model says that electrons are much harder to locate.
17)
When filling electrons into orbitals, which statement is FALSE?
The second choice is false because you should fill each orbital in a sublevel with one electron first before you pair any electrons.
The last choice is true because 6s is filled before 4f.
18)
As you travel from left to right along the electromagnetic spectrum, which of the following increases from left to right?
19)
The 4s sublevel is filled after the
20)
Which of the following sublevels is the one associated with the lowest energy?
21)
In order to occupy the same orbital, two electrons must have
22)
As the wavelength of light increases, the frequency/energy

Wavelength is inversely proportional to frequency/energy therefore if the wavelength increases, the frequency/energy will decrease.

23)
Which of the following types of radiation have a greater energy than that of ultraviolet radiation?

Greater energy refers to something farther to the right on the electromagnetic spectrum. Of the choices, x-rays have the greatest energy.

24)
When ignited, a copper compound burns with a green flame. The energy of this light is less than that of

If the frequency/energy is lower, that means the wavelength of green light is greater. Green light has a lower energy than only one of the choices given: x-rays.

25)
Which color has a longer wavelength than yellow light?
26)
How are the electron configurations the same for two different elements in the same group?
How are their dot structures the same?
27)
Briefly describe the difference between the line spectra for an atom and the continuous spectra of white light
28)
Briefly describe:
a)
the Bohr model of the atom
b)
the quantum mechanical model of the atom
c)
the Rutherford model of the atom
d)
the plum pudding model of the atom
29)
What is the wavelength of a light that has a frequency of 3.42 x 1011 ?
Write your answer in scientific notation by typing the number then e then the exponent. For example 8000 would be 8e3, 0.08 would be 8e-2.
m
Wavelength = speed of light / frequency λ = c / ν
λ =
c
ν
=
3.0 x 108 m/sec
3.42 x 1011 Hz
= 0.000877 m = 8.77 x 10-4 m
Remember that Hz is the same as s-1 so the seconds cancel out in
m/sec
Hz
leaving only m for the final unit.
30.)
What is the energy of a light that has a wavelength of 4.34 x 10-7
J
E =
hc
λ
=
(6.626 x 10-34 J˙sec)(3.0 x 108 m/sec)
4.34 x 10-7 m
= 4.56 x 10-19 J
31.)
Find the energy for an x-ray photon with a frequency of 2.4 x 1018
J
E = hν = (6.626 x 10-34 J˙sec)(2.4 x 1018 s-1) = 1.59 x 10-15 J
32.)
A wave has a wavelength of 1 x 10-6 meters, what is the frequency of this wave?
sec-1
ν =
c
λ
=
3.0 x 108 m/sec
1 x 10-6 m
= 3.0 x 1014 sec-1
33.)
What is the wavelength of light that has an energy of 2.0 x 10-24
m
E =
hc
λ
soλ=
hc
E
λ =
(6.626 x 10-34 J˙sec)(3.0 x 108 m/sec)
2.0 x 10-24 J
= 0.0994 m
34.)
Draw an orbital diagram for oxygen
This should be an energy level diagram or an arrow diagram with 8 electrons (or arrows) filled in.
The first two arrows should be pointing one up and one down in a space marked 1s.
The second two arrows should be pointing one up and one down in a space marked 2s.
The last four arrows should be spread in 3 orbitals in a space marked 2p. Two of those arrows should be paired and the other two should be unpaired.
Check your picture with this description.