Review of Atoms, Ions, Isotopes and electron configurations and math (chapter 4&5 Glencoe)
What is the difference between an Ion and an Atom?
Fill in the missing information for this table of atoms:
Element
Symbol
Mass
# protons
Co
35
75
15
# neutrons
# electrons
42
Fill in the electrons that are in each energy level for the following atoms
Element
symbol
1st shell
2nd shell
3rd shell
Potassium
K
______
______
______
Argon
Ar
______
______
______
Germanium Ge
______
______
______
Fill in the missing information for this table of Ions:
Element
Symbol
Mass
# protons
-3
N
7
20
Bromine
Br-1
anion
23
Sulfur anion
32
4th shell
______
______
______
# neutrons
18
36
12
16
Fill in the electrons that are in each energy level for the following ions
Element
ion symbol
1st shell
2nd shell
3rd shell
Selenium
________
______
______
______
Anion
________
__Ca+2___
______
______
______
Rubidium
Cation
________
______
______
# electrons
______
18
4th shell
______
______
______
Practice:
Give the electron configuration for Fe:
What is the last orbital filled for Al:
How many unpaired electron in the ground state of sulfur ?(draw the electron
configuration with arrows (or use auf bau diagram)
Which orbital represents higher energy 7s or 4d?
Name that element: (and indicate if excited or in ground state)
1s2 2s2 2p6 3s2 3p6 4s2 3d8
1s2 2s1 2p4
1s2 2s2 2p6 3s2 3p6
[Ar]4s2 3d2
1s2 2s2 2p6 3s2
Which electron configuration listed above would also represent the ion Ca+2
What is the frequency of a yellow line of wavelength 550nm (550 x 10-9 m)?
What is the energy of a 101.2 FM radio wave? (= 101.2 x 106 Hz)
Which has greater energy a yellow light or a green light?
Element X has two known isotopes: X-316 = 84.50% and X-320 =
15.50%
What is it’s average atomic mass (like the M&M lab)
ANSWERS
What is the difference between an Ion and an Atom?
Atoms are neutral (just as many protons as electrons; Ions have a net charge and are called
cations or anions
Fill in the missing information for this table of atoms:
Element
Symbol
Mass
# protons
cobalt
Co
59
27
Bromine
Br
80
35
Arsenic
As
75
33
Phosphorus
P
31
15
30
# neutrons
32
45
42
16
15
Fill in the electrons that are in each energy level for the following atoms
Element
symbol
1st shell
2nd shell
3rd shell
Potassium
K
___2___
___8___
___8___
Argon
Ar
__2____
___8___
___8___
Germanium Ge
___2___
___8___
___18___
Fill in the missing information for this table of Ions:
Element
Symbol
Mass
# protons
-3
Nitrogen
N
14
7
anion
Calcium
Ca+2
40
20
cation
Bromine
Br-1
80
35
anion
Sodium
Na+1
23
11
cation
Sulfur anion
S-2
32
16
# electrons
27
35
33
16
4th shell
___1___
______
___4___
# neutrons
7
# electrons
10
20
18
45
36
12
16
18
Fill in the electrons that are in each energy level for the following ions
Element
ion symbol
1st shell
2nd shell
3rd shell
4th shell
Selenium
___Se-2___ ___2___
__8____
___18___
___8___
_Calcium_
__Ca+2__
___2___
__8____
___8___
__0____
Cation
Rubidium
___Rb+1___ ___2___
___8___
__18____
__8____
Practice:
Give the electron configuration for Fe: 1s2 2s2 2p6 3s2 3p6 4s2 3d6
What is the last orbital filled for Al: 1s2 2s2 2p6 3s2 3p1
Last electron goes into 3p (but last COMPLETELY filled is the 3s)
How many unpaired electron in the ground state of sulfur
1s2 2s2 2p6 3s2 3p4 ; the 3p orbital looks like up down up up as arrows so… 2
unpaired
Which orbital represents higher energy 7s or 4d ?
7s
Name that element: (and indicate if excited or in ground state)
1s2 2s2 2p6 3s2 3p6 4s2 3d8
1s2 2s1 2p4
1s2 2s2 2p6 3s2 3p6
ground state Nickel
excited nitrogen
ground state argon
[Ar]4s2 3d2
ground state Titanium
1s2 2s2 2p6 3s2
ground state Magnesium
Which electron configuration listed above would also represent the ion Ca+2
1s2 2s2 2p6 3s2 3p6
ground state argon
What is the frequency of a yellow line of wavelength 550nm
F = c/ ; f= 3.0 x 108 / 550 x 10-9 = 5.45 x 1014 Hz
What is the energy of a 101.2 FM radio wave?
(E = h f ; h = 6.6 x 10-34 J s)
E = 6.6 x 10-34 J s x 101.2 x 106 s-1 = 6.8 x 10-26 J
Which has greater energy a yellow light or a green light?
Green light it has a shorter wavelength and higher frequency so more energy
Element X has two know isotopes: X-316 = 84.50% and X-320 =
15.50%
What is it’s average atomic mass (like the M&M lab)
84.5 % of 316 + 15.5 % of 320 =
267.02 + 49.60 = 316.62