What are the electronic configurations for fluorine and the fluoride
2. What element is the third-row analogue of oxygen? What are the
corresponding elements in the fourth and fifth rows? Write the electronic
configurations of all four elements, and point out the common features
that give them similar chemical properties. What are their atomic
numbers? As the atomic number increases, will the elements in this
set of four become more, or less, metallic? Why?
3. What are the electronic configurations of the following: P, K,
? What would the electronic configuration of each be in the first
excited state (i.e. one electron promoted to an unoccupied orbital
by the least possible addition of energy)?
4. Name two positive ions, a negative ion, and a neutral atom that
are isoelectronic with Cl.
What is their electronic configuration? For the ions, what is the
corresponding neutral-atom configuration of each?
5. Which of the electronic configurations shown below represents a
ground state of an atom, an excited state, and an impossible state?