Atoms with the strongest metallic properties are typically found on the left side and towards the bottom of the periodic table. The most metallic elements are those in groups 1 and 2, which include the alkali metals (e.g., lithium, sodium, potassium) and alkaline earth metals (e.g., magnesium, calcium). As you move down a group, the metallic character of these elements increases.
Additionally, towards the bottom of the periodic table, in the transition metals and lanthanides/actinides series, you also find elements with strong metallic properties. For example, elements like lead, barium, and bismuth exhibit high metallic characteristics.
Overall, the general trend for increasing metallic character is from the upper right to the lower left of the periodic table.