객관식
On the periodic table, gold has the atomic number 79. This means that:
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객관식
3. Sodium (Na) is found in which period of the periodic table?
A
Period 1
B
Period 2
C
Period 3
D
Period 3
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검증된 단계별 안내1
Recall that the periodic table is organized into periods (rows) and groups (columns), where each period corresponds to the principal energy level (n) being filled with electrons.
Identify the atomic number of sodium (Na), which is 11, meaning it has 11 electrons.
Determine the electron configuration of sodium: \$1s^2 2s^2 2p^6 3s^1$.
Note that the highest principal quantum number (n) in sodium's electron configuration is 3, indicating that its valence electron is in the third energy level.
Conclude that sodium is located in Period 3 of the periodic table because the period number corresponds to the highest occupied principal energy level.
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