2007-02-07 11:18:40 · 3 answers · asked by Gideon 1 in Science & Mathematics ➔ Physics
It has to do with the way atoms fill available energy levels when electrons are added. "In compound formation an atom tends to gain or loose electrons or to share electrons until there are eight electrons in its outer shell. " see for details
http://www.chem.queensu.ca/people/faculty/mombourquette/FirstYrChem/Molecular/Lewis/index.htm
2007-02-07 17:10:22 · answer #1 · answered by meg 7 · 1⤊ 0⤋
Polyatomic ions are bonded covalently within the ion, and bond ionically with other ions. If the ion has more protons than eletrons, it forms a positive cation. If there are more electrons, it forms a negative anion. There really is no rhyme or reason that you can figure out as to why they have ceratin charges. Just know that they do.
2007-02-07 20:27:41 · answer #2 · answered by Anonymous · 0⤊ 0⤋
i cant answer the first part but for the 2nd - if an atom combines with another and loses an electron, it becaome a positive ion (cation/+) but if it gains one, it becomes a negative ion (anion/-)
2007-02-07 19:22:38 · answer #3 · answered by Anonymous · 0⤊ 0⤋