Periodic & Atomic Dudes

________: grouped elements based on atomic masses into octaves (rows of 8)

________: grouped elements into triads based on like properties (gas, liquid, solid)

________: based his arrangement on atomic mass and columns with similar properties.

grouped elements into triads based on like properties (gas, liquid, solid)

grouped elements based on atomic masses into octaves (rows of 8)

based his arrangement on atomic mass and columns with similar properties

based his arrangement on atomic number