Main Group Elements Definition

Main Group Elements Definition In chemistry and physics, the main group elements are any of the chemical elements belonging to the s and p blocks of the periodic table. The s-block elements are group 1 (alkali metals) and group 2 (alkaline earth metals). The p-block elements are groups 13-18 (basic metals, metalloids, nonmetals, halogens, and noble gases). The s-block elements usually have one oxidation state (1 for group 1 and 2 for group 2). The p-block elements may have more than one oxidation state, but when this happens, the most common oxidation states are separated by two units. Specific examples of main group elements include helium, lithium, boron, carbon, nitrogen, oxygen, fluorine, and neon. Significance of the Main Group Elements The main group elements, along with a few light transition metals, are the most abundant elements in the universe, solar system, and on Earth. For this reason, main group elements are sometimes known as representative elements. Elements That Arent in the Main Group Traditionally, the d-block elements have not been considered to be main group elements. In other words, the transition metals in the middle of the periodic table and the lanthanides and actinides below the main body of the table are not main group elements. Some scientists do not include hydrogen as a main group element. Some scientists believe zinc, cadmium, and mercury should be included as main group elements. Others believe group 3 elements should be added to the group. Arguments may be made for including the lanthanides and actinides, based on their oxidation states. Sources King, R. Bruce (1995). Inorganic Chemistry of Main Group Elements. Wiley-VCH. ISBN 0-471-18602-3.Nomenclature of Inorganic Chemistry. (2014) International Union of Pure and Applied Chemistry.

Free Essays on Roman Gods

The ancient Romand worshiped many gods, godesses and spirits, each of whom was responsible for a different part of life. Juno was the goddess of woman; Jupiter, the king of the gods was also the god of the sky; Mercury was the god of merchants; Wulcan the god of fire; Mars the god of war; Minerva the goddess of wisdom; Venus the goddess of fertility and love. The ancient Romans adopted gods and goddesses from other cultures as well. Bacchusor or Dionysus, the Greek god of wine; Cybelle, the Turkish goddess of motherhood; and Isis from the Egyptian pantheon who was concerned with reincarnation. Emperors and empresses were sometimes worshiped after their deaths. Emperors showed their devotion to their favored deities by building temples to them. Roman citizens left offerings such as food, milk, wine, money, jewels or statues at temple alters and engaged in ceremonies and animal sacrifices to win the gods approval. The Romans were generally accepting of other people’s religions but persecuted the Christians because, among other things, they displeased the gods by refusing to patricipate in such animal sacrifices and unjust ceremonies. Christianity finally because the official religion during the 4th century in Rome. The Romans built large temples for these many gods. They were often built in places that people believed were special to their gods. The Acropolis, in Greece is one of these places. In ancient Greece, the Greeksk alson believed in many gods and goddesses. The gods behaved much like ordinary people, but they had great wisdon. They were wiser, more cunning, and more powerful. The gods not only controlled nature, but they also controlled people’s fate. There were 12 main gods of the Greek belief, known as the Olympians. Some of the most famous included Zeus, Athena, Poseidon, and Apollo. When you walked into a Greek or Roman temple, you would find a statue of a god or goddess at the end of a long, dark... Free Essays on Roman Gods Free Essays on Roman Gods The ancient Romand worshiped many gods, godesses and spirits, each of whom was responsible for a different part of life. Juno was the goddess of woman; Jupiter, the king of the gods was also the god of the sky; Mercury was the god of merchants; Wulcan the god of fire; Mars the god of war; Minerva the goddess of wisdom; Venus the goddess of fertility and love. The ancient Romans adopted gods and goddesses from other cultures as well. Bacchusor or Dionysus, the Greek god of wine; Cybelle, the Turkish goddess of motherhood; and Isis from the Egyptian pantheon who was concerned with reincarnation. Emperors and empresses were sometimes worshiped after their deaths. Emperors showed their devotion to their favored deities by building temples to them. Roman citizens left offerings such as food, milk, wine, money, jewels or statues at temple alters and engaged in ceremonies and animal sacrifices to win the gods approval. The Romans were generally accepting of other people’s religions but persecuted the Christians because, among other things, they displeased the gods by refusing to patricipate in such animal sacrifices and unjust ceremonies. Christianity finally because the official religion during the 4th century in Rome. The Romans built large temples for these many gods. They were often built in places that people believed were special to their gods. The Acropolis, in Greece is one of these places. In ancient Greece, the Greeksk alson believed in many gods and goddesses. The gods behaved much like ordinary people, but they had great wisdon. They were wiser, more cunning, and more powerful. The gods not only controlled nature, but they also controlled people’s fate. There were 12 main gods of the Greek belief, known as the Olympians. Some of the most famous included Zeus, Athena, Poseidon, and Apollo. When you walked into a Greek or Roman temple, you would find a statue of a god or goddess at the end of a long, dark...