The Periodic Table arranges elements by proton number.
Columns are groups (elements with similar properties) and rows are periods. Metals are on the left; non-metals on the right. Group 1 are the reactive alkali metals; Group 0 (8) are the unreactive noble gases.
Remember
- Groups = columns · Periods = rows.
- Group 1 = alkali metals · Group 0 = noble gases.