In 1864, with about 50 elements known, the British chemist John Newlands noticed a pattern when he arranged the elements in order of atomic mass, or weight. He found that the properties of the elements seemed to repeat every eighth element.
Answer:
Were usually closely contested affairs
Explanation:
The political scenario was notable in that despite a certain level of corruption, turnout was very high and national elections saw two evenly matched parties (Republican and Democratic). The dominant issues were cultural (i.e prohibition, education, and ethnic or racial groups) and economic (tariffs and money supply).
The emergency operations plan is a key component of an emergency management program that "<span>c. Establishes the overall authority, roles, and functions performed during incidents," since this can be applied to a wide variety of scenarios. </span>