Atomic Age

This implies many things. The atomic number of an element indicates how many electrons and protons there are. The number of electrons should always be the same of protons because their charges cancel and the overall charge of the atom is neutral, and so the number of protons and electrons…

1869, a chemist named Dmitri Mendeleev and a German chemist named Lothar Meyer proposed a “periodic table of elements” on the base of periodic repetition of properties. In 1864, before Mendeleev, and John Newlands arranged the elements in order of atomic mass where every eight elements has similar properties. He called the relationship “the law of octaves”. Even so, this law could not be applied for the elements beyond Calcium, so it was not accepted by the scientific community. The modern…

Chromium got this name because of the many different colors in the element. This element is hard, metallic and shiny. Chromium doesn't tarnish. Chromium is a metal element. Chromium's symbol is "Cr" and has an atomic number of 24. This metal is the first element in group 6. It has an Atomic mass of 52.0. Chromium has 4 known isotopes. Chromium is a "transitional metal." The other family members in period 6 are molybdenum (Mo), tungsten (W), and seaborgium (Sg). All elements in group 6 are…

Dmitri Ivanovich Mendeleyev, born on February 8, 1834, was believed to be the youngest of 14 children. His father, Ivan Pavlovich Mendeleyev was a teacher at a local gymnasium. Around the time Dmitri was born, his father went blind and later died in 1847. Consequently to support the family, his mother Mariya Dmitriyevna Kornileva began working at a small glass factory in a nearby town, and eventually started managing it. On December of 1848, the factory burned down, and the family moved to St.…

determined by the atomic number, not by the atomic weight. Mosely used a device known as an electron gun to fire streams of electrons at different elements. He found out that different elements give off different frequency of X-rays. Mosely calculated these frequencies and discovered that the frequency relating to atomic number gives off reasonable results, while frequencies of the atomic mass is unpromising. Not only he concluded that elements should be classified by its atomic number. He…

Group 1 Elements Referring to the table created from observing the characteristics of the three elements from group 1, Lithium, Sodium, and Potassium, we can see that they all share the appearance of being lustrous and metallic, with a silvery-white presentation, and it is also known that they are all alkali metals. It is also noticed that they are all soft metals easily cut with a knife rather than most metals such as calcium or iron. All three elements are stored within oil, with Sodium as an…

Alchemists used to obsess over chrysopoeia, the transmutation of regular metals, such as copper, into gold. However, they were not aware at the time that copper and gold were two different atomic elements and instead believed them to be compounds. Thinking these metals could be changed chemically or physically in labs, alchemists pursued this dream to no advantage. Although it is not possible to change ordinary metals to gold through chemical reactions, physical reactions, radioactive decay, or…

Consequently, he chose the cube because it contains eight vexes. Its orderly shape appealed to the common scientific notion that the universe contains patterns and organization. A conceivable structure like the cube allowed for easy application of Lewis’ atomic postulates. Lewis’ model explained his six postulates about the chemical behaviors of an atom. The first postulate is that an atom has an essential kernel that does not change in chemical reactions and “possesses an excess of positive…

gold crown ring made out of. What is interesting about this topic is that there is a lot of ways to study the gold crown ring. For example, you can test the mass, volume, and density of the ring. In the periodic table Au is the symbol for Gold, it’s atomic number is 79. The Properties of Matter are Mass, Weight, Volume, and Length. Each property has its own way of working with different types of things. It is believed that the material of the crown in this study is fake gold because gold has the…

Atoms are! Atoms are so important. Atoms are the building blocks of the world. They are in everything. Millions of little atoms join together to create the world and everything in it. They can also be used for other purposes not naturally, such as an atomic bomb. Atoms are critical to our survival at a whole. The history of the atom dates back to ancient times. Ancient Greeks had their own ideas based on atoms. Some believed they were tiny and hard. They believed the atom could not be…