Multiple Choice
The atomic number of sulfur is 16. This indicates that a sulfur atom contains:
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2. Atoms & Elements
The Atom
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In an atom, which type of electrons are primarily responsible for shielding the nucleus from the valence electrons?
A
Valence electrons
B
Neutrons
C
Protons
D
Core electrons
Verified step by step guidance1
Understand the concept of electron shielding: Shielding occurs when inner electrons reduce the effective nuclear charge felt by outer (valence) electrons.
Identify the types of electrons in an atom: Core electrons are those in inner shells, while valence electrons are in the outermost shell.
Recognize that protons and neutrons are in the nucleus and do not shield electrons; protons contribute to nuclear charge, and neutrons have no charge.
Know that valence electrons do not shield themselves effectively because they are in the same energy level and experience similar nuclear attraction.
Conclude that core electrons, being closer to the nucleus and between the nucleus and valence electrons, are primarily responsible for shielding the nucleus from valence electrons.
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