Question

within the periodic table, elements are organized consecutively by
1 point
atomic mass within columns.
atomic number within columns.
atomic mass within rows.
atomic number within rows.

Explanation:

The periodic table organizes elements by atomic number. Within rows (periods), elements are arranged consecutively by atomic number. Atomic mass is not the basis for the sequential arrangement within rows, and within columns (groups), elements have similar properties, not a consecutive arrangement by atomic number or mass in the sequential sense of the question. So the correct option is the one stating "atomic number within rows".

Answer:

atomic number within rows