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How many electrons are required to completely fill the first energy level (n = 1) of an atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does an oxygen (O) atom have?
A
6
B
8
C
2
D
4
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Identify the atomic number of oxygen, which is 8. This means an oxygen atom has 8 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.
Determine the electron configuration of oxygen: the first 2 electrons fill the first shell, and the remaining 6 electrons go into the second shell.
Understand that valence electrons are the electrons in the outermost shell of an atom. For oxygen, the outermost shell is the second shell.
Count the electrons in the outermost shell (second shell), which is 6. Therefore, oxygen has 6 valence electrons.
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