객관식
How many valence electrons does a neutral atom with 15 protons have?
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객관식
How many p electrons does selenium (Se), atomic number 34, possess in its ground state?
A
12
B
6
C
18
D
10
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검증된 단계별 안내1
Identify the electron configuration of selenium (Se) with atomic number 34. This means selenium has 34 electrons in its neutral ground state.
Recall the order of filling orbitals according to the Aufbau principle: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, etc.
Write the electron configuration for selenium step-by-step, filling orbitals until you reach 34 electrons:
\[1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^2\ 3d^{10}\ 4p^4\]
Count the total number of electrons in all p orbitals (2p, 3p, and 4p) by adding the electrons in each p subshell: 2p^6 + 3p^6 + 4p^4.
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