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Electron Configurations And Isotopes
Test Description: Electron configurations and isotopes
Instructions: Answer all questions to get your test result.
1) This is the electron configuration for what element? 1s2 2s2 2p6 3s2 3p4
A
Arsenic
B
Chlorine
C
Selenium
D
Sulfur
2) What comes after 7s?
A
5d
B
5f
C
6d
D
6f
3) How many protons does Bromine - 79 have?
A
79
B
44
C
35
D
30
4) How many neutrons does Barium - 138 have?
A
82
B
73
C
138
D
56
5) The top left number of the nuclear symbol is the
A
Mass number
B
Number of neutrons
C
Atomic numbers
D
Number of protons
6) How many valence electrons does Gallium have?
A
5
B
3
C
2
D
4
7) How many valence electrons does Cesium have?
A
4
B
1
C
2
D
3
8) How many valence electrons does Helium have?
A
6
B
8
C
4
D
2
9) How many protons does Titanium - 47 have?
A
22
B
47
C
25
D
48
10) The number in the bottom left of the nuclear symbol is the
A
Atomic number
B
Mass number
C
Number of neutrons
D
Charge
*select an answer for all questions
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