Multiple Choice
Which of the following is the correct electron configuration for beryllium (Be)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which statement best describes the arrangement of electrons in an atom of fluorine (F)?
A
Fluorine has 9 electrons all located in a single shell.
B
Fluorine has 9 electrons arranged as 2 in the first shell and 7 in the second shell.
C
Fluorine has 7 electrons in the first shell and 2 in the second shell.
D
Fluorine has 9 electrons arranged as 1 in the first shell and 8 in the second shell.
Verified step by step guidance1
Recall that the atomic number of fluorine (F) is 9, which means it has 9 electrons in a neutral atom.
Understand that electrons are arranged in shells (energy levels) around the nucleus, with the first shell holding up to 2 electrons and the second shell holding up to 8 electrons.
Place the first 2 electrons in the first shell because it is the closest to the nucleus and fills first according to the Aufbau principle.
Distribute the remaining 7 electrons in the second shell, since the first shell is full and the second shell can hold up to 8 electrons.
Conclude that the correct electron arrangement for fluorine is 2 electrons in the first shell and 7 electrons in the second shell.
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