Multiple Choice
The chemical reactivity of an element is primarily determined by which of the following?
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- 1. Intro to General Chemistry3h 48m
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- 24. Transition Metals and Coordination Compounds3h 19m
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- Complex Ions5m
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- Crystal Field Theory Summary8m
- Magnetic Properties of Complex Ions9m
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- Magnetic Properties of Complex Ions: Octahedral Complexes11m
10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does helium (He) have?
A
8
B
2
C
0
D
1
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Verified step by step guidance1
Identify the element in question, which is helium (He).
Recall that valence electrons are the electrons in the outermost shell of an atom.
Determine the electron configuration of helium. Since helium has an atomic number of 2, it has 2 electrons.
Recognize that helium's electrons fill the first energy level (1s orbital), which is also its outermost shell.
Conclude that helium has 2 valence electrons because both electrons are in its outermost shell.
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