Multiple Choice
How does a sodium atom achieve a stable octet of valence electrons?
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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 element has 3 energy levels and 4 valence electrons?
A
Silicon (Si)
B
Beryllium (Be)
C
Carbon (C)
D
Oxygen (O)
Verified step by step guidance1
Understand that the number of energy levels (or electron shells) corresponds to the period (row) of the element in the periodic table. An element with 3 energy levels is in period 3.
Recognize that valence electrons are the electrons in the outermost energy level. For main group elements, the group number often indicates the number of valence electrons.
Identify the elements given: Beryllium (Be), Carbon (C), Oxygen (O), and Silicon (Si), and determine their periods and valence electrons.
Check which element is in period 3 (has 3 energy levels). Among the options, Silicon (Si) is in period 3, while Beryllium, Carbon, and Oxygen are in periods 2 or 1.
Confirm that Silicon (Si) has 4 valence electrons, matching the requirement of 3 energy levels and 4 valence electrons.
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