8. The Machinery Behind The       Periodic Table   Previous PageNext Page

(c) 1s 2s 2p 3s
(d) 1s 2s 2p 3s

Assuming that these all represent neutral atoms and not ions, identify the atoms (except for impossible combinations, of course).

6. Ten elements and their electronic configurations are given below. For each, decide whether a neutral atom, or a positive or negative ion, is represented. In addition, specify whether the state represented is a ground state, an excited state or an impossible state.

(a) Li: 1s 2p (b) H: 1s
(c) S: 1s 2s 2p 3s 3p (d) C: 1s 2s 2p 2d
(e) Ne: 1s 2s 2p (f) N: 1s 2s 2p
(g) F: 1s 2s 2p 3s (h) He: 1p
(i) Sc: 1s 2s 2p 3s 3p 3d 4s (j) O: 1s 2s 2p

Explain what is wrong with each impossible state.

7. If the filling of electron shells occurred in the most straightforward way implied by the structure of the periodic table, what would be the electronic configuration of chromium (Cr, atomic number 24)? Why the difference?

  Page 2 of 2 HomeGlossary