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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
Selenium
B
Arsenic
C
Sulfur
D
Chlorine
2) What comes after 7s?
A
6f
B
5d
C
6d
D
5f
3) How many protons does Bromine - 79 have?
A
44
B
30
C
35
D
79
4) How many neutrons does Barium - 138 have?
A
82
B
138
C
73
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
4
D
2
7) How many valence electrons does Cesium have?
A
4
B
2
C
1
D
3
8) How many valence electrons does Helium have?
A
2
B
8
C
6
D
4
9) How many protons does Titanium - 47 have?
A
25
B
47
C
48
D
22
10) The number in the bottom left of the nuclear symbol is the
A
Charge
B
Atomic number
C
Number of neutrons
D
Mass number
*select an answer for all questions
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