Periodicity is best defined as: the fact that elements increase in atomic mass in a regular way. the repeating nature of physical and chemical properties with increasing atomic number. the regular growth of atomic size with atomic mass. the consistent decrease of nuclear charge with atomic mass. the repeating nature of atomic nuclear structure.

alfred von schlieffen, german army chief of staff, was given instructions to devise a strategy that would be able to counter a joint attack. in december, 1905, he began circulating what later became known as the schlieffen plan. schlieffen argued that if war took place it was vital that france was speedily defeated.

a chemical reaction happens

explanation: