In the late 1800s, Mendeleev developed a periodic table of the elements based largely on atomic mass. In the early 190 the periodic table based on increasing atomic number. Which evidence supported Mosely's modification to Mendeleev's

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

i think so it’s will be b yes i believe its