Multiple Choice
Which element typically has 3 valence electrons (based on its main-group periodic table group)?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
Multiple Choice
In an atom, which part is primarily responsible for chemical bonding (and thus chemical reactivity)?
A
The atomic mass number
B
Neutrons in the nucleus
C
Protons in the nucleus
D
Valence electrons in the outermost electron shell
Verified step by step guidance1
Understand that chemical bonding and reactivity depend on how atoms interact with each other, which is determined by the electrons involved in these interactions.
Recall that atoms have electrons arranged in shells around the nucleus, and the outermost shell is called the valence shell.
Recognize that valence electrons are the electrons in the outermost shell, and these electrons are the ones that participate in forming chemical bonds.
Note that protons and neutrons are located in the nucleus and primarily determine the identity and mass of the atom, but they do not directly participate in bonding.
Conclude that the valence electrons in the outermost electron shell are primarily responsible for chemical bonding and thus chemical reactivity.
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