Mendeleev created the first periodic table based on atomic weight. He observed that many elements had similar properties, and that they occur periodically. Hence, the table's name. His periodic law states that the chemical and physical properties of the elements vary in a periodic way with their atomic weights.
Location of Guatemala City on a map. Guatemala City is the capital city of Guatemala. It has a population of 994,938, and is located on a latitue of 14.64 and longitude of -90.51. Guatemala City is also the political center of Guatemala, which is considered a Republic, and home to its Executive head of state.
The peak Mayan population may have reached two million people, most of whom were settled in the lowlands of what is now Guatemala. After 900 ce, however, the Classic Maya civilization declined precipitously, leaving the great cities and ceremonial centres vacant and overgrown with jungle vegetation.