A table with 5 columns and 5 rows labeled facts about 4 elements. The first column labeled element has entries bismuth (B i), nitrogen (N), oxygen (O), sodium (N a), thallium (T l). The second column labeled atomic mass (a m u) has entries 209, 14, 16, 23, 204. The third column labeled total electrons has entries 83, 7, 8, 11, 81. The fourth column labeled valence electrons has entries 5, 5, 6, 1, 3. The fifth column labeled year isolated has entries 1753, 1772, 1772, 1807, 1861.
bismuth and thallium, because their atomic masses are very similar
nitrogen and oxygen, because they were both first isolated in the same year
sodium and thallium, because their names both end in the same suffix: -ium
bismuth and nitrogen, because they have the same number of valence electrons
1 answer
The two elements most likely in the same group are bismuth (Bi) and thallium (Tl), because their atomic masses are very similar (209 for bismuth and 204 for thallium).
Bismuth and thallium also belong to the same group (Group 13) on the periodic table, which is characterized by having similar properties due to their similar electron configurations. The similarity in atomic mass further supports their classification in the same group.
