Give the ground state electron configuration for F⁻.
The number of protons is an atom is called as atomic number. For a neutral atom, the number of protons is always equal to number of electrons hence atomic number is equal to number of electrons for a neutral atom.
The distribution of electrons in an atom can be shown with the help of electronic configuration.
The electronic configuration of an element represents the number of electrons in different energy levels of an element. To write the electronic configuration of an element with the help of an atomic numbers, a certain sequence of energy levels must be followed.
The atomic number of F is 9 therefore it must have 9 protons and 9 electrons. In F- ion, there must be 10 electrons and 9 protons as anion has extra electrons.
The electronic configuration of F- ion is:
1s2, 2s2, 2p6
A) 1s2, 2s2, 2p6