periodic table.

aid antimony arsenic chart chemical chemicals chemistry close closeup code computational contraption data detail details educating education educational element elements gallium germanium graphic graphically group groups indium lab learning lesson lore macro metal metals mineral minerals object objective orientation pattern periodic periodical phosphor rote schema schemata schematic schematically school schooling science sciences sign silicon spec specification statistic statistical statistically statistics stats sulfur sulphur summary symbol symbols synoptic table teaching teachings tool total tuition utility