Multiple Choice
How many valence electrons are in a neutral lithium atom (Li)?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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In the simplified valence-electron model, what most directly determines the chemical reactivity of an atom?
A
The number of valence electrons in the outermost energy level
B
The total number of electrons in the atom
C
The atomic mass of the element
D
The number of neutrons in the nucleus
Verified step by step guidance1
Understand that chemical reactivity is primarily influenced by how atoms interact with each other, which depends on their ability to gain, lose, or share electrons.
Recall that valence electrons are the electrons in the outermost energy level (shell) of an atom, and these electrons are involved in forming chemical bonds.
Recognize that the number of valence electrons determines an atom's tendency to react, as atoms seek to achieve a full outer shell (often following the octet rule).
Note that the total number of electrons, atomic mass, or number of neutrons do not directly influence chemical reactivity in the simplified valence-electron model.
Conclude that the chemical reactivity of an atom is most directly determined by the number of valence electrons in its outermost energy level.
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