Electrons always fill orbitals in the same order. Each s orbital holds 2 electrons, each set of p orbitals holds 6 electrons, each set of d orbitals holds 10 electrons, and each set of forbitals holds 14 electrons. The order in which orbitals are filled, from first to last, is:
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p7s 5f 6d 7p
To what element does the following electron configuration correspond?
1s22s22p63s23p5
OA. boron: 5 electrons
OB. argon: 18 electrons
OC. sodium: 11 electrons
OD. chlorine: 17 electrons