Trends run through the periodic table, with nonmetallic character (keeping their own electrons) increasing from left to right across a period, and from down to up across a group, and metallic ...

The cover of this issue shows an artistic representation of the equations of state of the periodic ... all-electron codes in each of the 10 crystal structure configurations shown on the table.

The ions formed have a full outer electron shell, so are very stable. See the study guide on groups in the periodic table for more information.