Answer :
The configuration for the valence shell electrons only is 1s2.
Solution:
F 9 electrons
5p+2s=7
9-7 =2
1s2.
Valence electrons only affect s and p orbitals so you can have up to 8 valence electrons. On the other hand, the ground state electron configuration is the electron configuration of the atom including all electrons. A valence electron is an electron in the outermost shell or energy level of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.
Electron configuration refers to the total number of electrons in an atom and how they are organized between electron shells. The first shell can hold two electrons. A second shell can hold her eight electrons. A third shell can hold 32 electrons. Within the shell, the electrons are further grouped into four different types of subshells.
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