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How many valence electrons does an iron (Fe) atom have in its ground state?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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In the electron configuration of nitrogen (atomic number 7), what is the role of the 2s electrons?
A
They are found in the 3s subshell.
B
They are responsible for the color of nitrogen gas.
C
They are valence electrons that participate in chemical bonding.
D
They are core electrons and do not participate in chemical bonding.
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Identify the atomic number of nitrogen, which is 7, meaning it has 7 electrons to arrange in its electron configuration.
Write the electron configuration of nitrogen: \(1s^2\ 2s^2\ 2p^3\).
Understand that electrons in the 1s subshell are core electrons, while those in the 2s and 2p subshells are valence electrons because they are in the outermost shell (n=2).
Recognize that valence electrons are the ones involved in chemical bonding, while core electrons generally do not participate in bonding.
Conclude that the 2s electrons in nitrogen are valence electrons and therefore participate in chemical bonding.
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