Multiple Choice
How many valence electrons does a fluorine atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a neutral boron (B) atom have?
A
5
B
3
C
4
D
2
Verified step by step guidance1
Identify the atomic number of boron (B), which is 5. This means a neutral boron atom has 5 electrons in total.
Recall that electrons are arranged in energy levels (shells) around the nucleus. The first shell can hold up to 2 electrons, and the second shell can hold up to 8 electrons.
Distribute the 5 electrons of boron into the shells: fill the first shell with 2 electrons, then place the remaining electrons in the second shell.
Recognize that valence electrons are the electrons in the outermost shell. For boron, the outermost shell is the second shell.
Count the electrons in the outermost shell (second shell) to find the number of valence electrons. This will give the number of valence electrons for a neutral boron atom.
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