Question

drag and drop the correct answer to the correct spot. the atomic mass of elements increases moving ? each group and ? across each period. answer bank up down left right increasing atomic mass

Explanation:

As shown in the periodic - table diagram, atomic mass increases as we move down a group (more energy levels and usually more protons, neutrons) and to the right across a period (more protons and neutrons as atomic number increases).

Answer:

DOWN, RIGHT