Atomic mass

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…

an atom is the proton. The proton is a very important part of an atom, because the atomic number of an atom is equivalent to the number of protons that that atom has. Additionally, the mass of an atom is equal to the sum of the number of protons and the number of neutrons of that atom. The number of electrons that an atom has is also equal to the number of protons that that atom has.…

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…

The basis of Mendeleev’s periodic table was categorizing the elements according to their physical and chemical characteristics with regard to their atomic weights. Mendeleev was the first to come up with a structure for the periodic table with columns and rows. There were other scientists who have worked on tabulating information of the elements even before Mendeleev, however, he was the first scientist to come up with a periodic trend to predict the properties of elements which were not…

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…

Scientist Contribution Significance Lavoisier (1743-1794) Antonie-Laurent Lavoisier was born on August 26, 1743 in France’s capital city, Paris. One of his major discoveries was the founding of the law of conservation of mass. This law states the weights of reagents and products are conserved through any chemical reactions. This is demonstrated through his combustion experiments. He pointed out that combustion requires air, since the reactants are weighed heavier than its products. This…

moving about combining and recombining” (European Graduate School). Later on, a scientist named John Dalton had a similar theory which became well known. In his theory he states that atoms cannot be divided, all atoms of an element must have the same mass and properties, atoms can be rearranged to form compounds and that a combinations…

prove his theory, but he was close to the truth about atoms. In the year 1803, John Dalton contributed to the Atomic Theory. He came up with his own theory of atoms after researching pressures of gases. Dalton’s theory included that all matter is made of atoms. He said that atoms are indivisible and indestructible. He also theorized that atoms of an element are identical in properties and mass. Dalton stated that compounds are formed by combining two or more different types of atoms. Lastly,…

The atomic number for Neon is 10, keeping in mind that the atomic number is the number of protons in an element. The atomic mass of Neon is 20.180, which when rounded up will become an atomic mass of 20. The state of matter Neon is mainly in is a gaseous state. The full electron configuration of neon is 1s2 2s2 2p6, and the abbreviated electron configuration…

consists of 17 protons, an average of 18.5 neutrons and 17 electrons. It has an atomic number of 17, and an average nuclear charge of 35.5. There are 2 isotopes of chlorine that are 35Cl and 37Cl. 35Cl has an atomic mass of 35 and a natural abundance of 75%. 37Cl has an atomic mass of 37 and a natural abundance of 25%. The average atomic mass or nuclear charge equates to 35.5. Both of the isotopes have the same atomic number. (BBC Bitesize. Atoms and the periodic table. 2014) Gold: Au, Arsenic:…