The calculations were performed using the PySCF 76 and mrh 78 packages. We adopted the PySCF implementation of IP-EOM-CC and extended it to the core level with the help of the core valence separation (CVS) approximation. The density matrix embedding framework from the mrh package was employed, resulting in the quantum embedding-based EOM-CC method referred to as DMET-IP-CVS-EOM-CC. To account for scalar relativistic effects, the spin-free exact two-component (SFX2C) one-electron Hamiltonian was utilized. In the frozen core-approximation, for the second row, the 1s orbitals, and for the third row, the 1s, 2s, and 2p orbitals were kept frozen. We have used recontracted correlation-consistent basis sets (CC-PCVXZ, where X = D, T) taken from the CFOUR 80 software package. The molecular geometries and other relevant information are detailed in their respective sections.