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# What is the ground state electron configuration of calcium ,titanium, rhodium lead, and erbium?

see below

Calcium - ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2##

Titanium- ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^2##

Rhodium- ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 4d^8 5s^1##

Lead- ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^2##

Erbium- ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^12##