Multiple Choice
How many valence electrons do elements in the nitrogen group (Group 15) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons are present in a neutral atom of nitrogen (atomic number 7)?
A
3
B
5
C
2
D
7
Verified step by step guidance1
Identify the atomic number of nitrogen, which is 7. This means a neutral nitrogen atom has 7 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom that participate in chemical bonding.
Determine the electron configuration of nitrogen using the Aufbau principle: fill the 1s orbital first, then 2s, and then 2p orbitals.
Write the electron configuration for nitrogen: $1s^2 2s^2 2p^3$. The electrons in the first shell (1s) are core electrons, and those in the second shell (2s and 2p) are valence electrons.
Count the valence electrons by adding the electrons in the 2s and 2p orbitals: $2 + 3 = 5$ valence electrons.
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