8. The Machinery Behind The       Periodic Table   Previous PageNext Page
1. What are the electronic configurations for fluorine and the fluoride ion?

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, Mg ? 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?

(a) 1s 2s 2p 3s 3p
(b) 1s 2s 2p 3s 3p (cont...)
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