after hydrogen, what do you start all electron configurations with? 1d^{10} 1f^{14} 1s^{2} 1p^{6}

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# Brief Explanations:
Electron configurations follow the Aufbau principle. The first energy level ($n = 1$) has only an $s$ - orbital. The $s$ - orbital can hold a maximum of 2 electrons. Hydrogen ($H$) has 1 electron in the $1s$ orbital ($1s^{1}$). The next element, helium ($He$), fills the $1s$ orbital ($1s^{2}$). For all other elements, when writing the electron configuration, we start with the filled $1s$ orbital (except for hydrogen which has $1s^{1}$). The $1p$ and $1d$ orbitals do not exist (the $p$ - orbitals start from $n = 2$ and $d$ - orbitals start from $n=3$), and the $1f$ orbital also does not exist ($f$ - orbitals start from $n = 4$).

# Answer:
$1s^{2}$

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