Multiple Choice
How many valence electrons are present in a molecule of HCN (hydrogen cyanide)?
10. Periodic Properties of the Elements
Valence Electrons of Elements
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The reactivity of an element can often be determined by examining the element's:
A
number of valence electrons
B
melting point
C
number of neutrons
D
atomic mass
Verified step by step guidance1
Understand that the reactivity of an element is primarily influenced by how easily it can gain, lose, or share electrons during chemical reactions.
Recall that valence electrons are the electrons in the outermost shell of an atom and are responsible for chemical bonding and reactivity.
Recognize that the number of valence electrons determines an element's tendency to react with other elements to achieve a stable electron configuration.
Note that properties like melting point, number of neutrons, and atomic mass do not directly determine chemical reactivity.
Conclude that examining the number of valence electrons is the best way to predict an element's reactivity.
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