Multiple Choice
How many valence electrons are in a neutral atom of fluorine (F)?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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In a simplified model of atomic structure, how an atom reacts chemically depends primarily on which of the following?
A
The total number of electrons in all energy levels combined
B
The number of neutrons in its nucleus
C
The number of valence electrons in its outermost energy level
D
The atomic mass of the element
Verified step by step guidance1
Understand that an atom's chemical reactivity is mainly determined by the electrons involved in bonding, which are found in the outermost energy level, called valence electrons.
Recall that the total number of electrons includes all electrons in all energy levels, but inner electrons do not typically participate in chemical reactions.
Recognize that neutrons, located in the nucleus, affect atomic mass and stability but do not influence chemical reactivity directly.
Note that atomic mass is the sum of protons and neutrons and does not determine how an atom reacts chemically.
Conclude that the key factor for chemical behavior is the number of valence electrons in the outermost energy level, as these electrons are responsible for forming chemical bonds.
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