Multiple Choice
How many valence electrons does a helium (He) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How does the number of valence electrons in an atom influence its chemical reactivity?
A
The number of valence electrons does not affect an element's reactivity.
B
Elements with a full valence shell are generally less reactive.
C
Elements with more valence electrons are always more reactive.
D
Elements with fewer valence electrons are always less reactive.
Verified step by step guidance1
Understand that valence electrons are the electrons in the outermost shell of an atom and are primarily responsible for chemical bonding and reactivity.
Recognize that atoms tend to react in ways that allow them to achieve a full valence shell, often resembling the electron configuration of the nearest noble gas, which is a stable arrangement.
Note that elements with a full valence shell (such as noble gases) are generally less reactive because they have little tendency to gain, lose, or share electrons.
Consider that elements with nearly full or nearly empty valence shells tend to be more reactive because they are more likely to lose, gain, or share electrons to achieve stability.
Conclude that the number of valence electrons influences reactivity by determining how easily an atom can achieve a full valence shell, making elements with full valence shells less reactive and those with incomplete valence shells more reactive.
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