Multiple Choice
A neutral carbon atom has atomic number 6. How many electrons does a neutral carbon atom contain?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Number of Electrons
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An element possesses 4 energy levels. How many total electrons can it theoretically hold?
A
72
B
100
C
110
D
60
Verified step by step guidance1
Understand that each energy level (or shell) can hold a specific maximum number of electrons. The formula to determine the maximum number of electrons in a shell is 2n^2, where n is the principal quantum number (energy level).
Calculate the maximum number of electrons for the first energy level (n=1) using the formula: 2(1)^2 = 2 electrons.
Calculate the maximum number of electrons for the second energy level (n=2) using the formula: 2(2)^2 = 8 electrons.
Calculate the maximum number of electrons for the third energy level (n=3) using the formula: 2(3)^2 = 18 electrons.
Calculate the maximum number of electrons for the fourth energy level (n=4) using the formula: 2(4)^2 = 32 electrons. Then, sum the electrons from all energy levels to find the total number of electrons the element can theoretically hold.
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