Calcium in Ca(OH)2 exists together an ion Ca2+. The electron configuration of Ca2+ is equivalent to Argon, with orbitals as much as 3p filled v electrons. Normally, Ca has the construction of 4s2. is shorthand for 1s22s22p63s23p6. You might see this shorthand because that noble gas electron construction on the MCAT.

You are watching: What is the complete electron configuration for calcium

A) 1s22s22p6, incorrect, This is the configuration for Neon, Na+, and also Mg2+.

B) 1s22s22p63s2, incorrect, This is the configuration for Mg.

C) 1s22s22p63s23p6, correct, Ca2+ has lost the 4s1 and 4s2 electrons.

D) 1s22s22p63s23p64s2, incorrect, This is the configuration for Ca, yet not Ca2+.

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