Multiple Choice
How many p electrons are present in a neutral atom of selenium (Se)?
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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
Which electrons are primarily involved in chemical reactions?
A
All electrons in the atom
B
Valence electrons
C
Core electrons
D
Only s-orbital electrons
Verified step by step guidance1
Understand that chemical reactions involve the making and breaking of bonds between atoms.
Recognize that electrons in the outermost shell of an atom, called valence electrons, are the ones that participate in bonding and chemical reactions.
Core electrons, which are closer to the nucleus and in inner shells, are generally not involved because they are held more tightly and do not interact with other atoms.
Note that not all s-orbital electrons are involved; only those in the outermost shell (valence s electrons) participate, along with valence electrons in other orbitals (p, d, f).
Therefore, the electrons primarily involved in chemical reactions are the valence electrons.
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