Multiple Choice
How many valence electrons do the alkaline earth metals possess?
4
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many electrons does a nitrogen atom gain in order to achieve a noble-gas electron configuration?
A
2
B
1
C
3
D
5
Verified step by step guidance1
Identify the atomic number of nitrogen, which is 7. This means a neutral nitrogen atom has 7 electrons.
Determine the electron configuration of nitrogen in its ground state. Nitrogen's electron configuration is $1s^2 2s^2 2p^3$.
Recognize the nearest noble gas that nitrogen aims to achieve the electron configuration of. The noble gas after nitrogen is neon, with an atomic number of 10.
Calculate the difference in the number of electrons between nitrogen and neon: $10 - 7 = 3$. This means nitrogen needs to gain 3 electrons to have the same electron configuration as neon.
Conclude that nitrogen gains 3 electrons to achieve a noble-gas electron configuration, resulting in the electron configuration $1s^2 2s^2 2p^6$.
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