1869 Dmitri Mendeleev Research Paper

In 1869 Dmitri Mendeleev introduced a new concept of how to read, understand, and use several elements for chemical equations and experiments based on their properties. This concept is known as The Periodic Table which, cited from the Merriam-Webster dictionary, is "an arrangement of chemical elements based on the periodic law". However, even though he was the first to find out a pattern between every element, he unfortunately was not the first to attempt at the arrangement of the elements. The periodic table of elements is a very organized set of chemical elements placed in many counts of patterns. Other chemists had attempted to find the patterns and hold them on a table. Such as Antoine Lavoisier, Jacob Berzelius, John Newland, Johann

Then there are two letters which is the element symbol in the middle of the box, usually the element name is under the two letters. I need the very bottom of the box is the mass number, the mass number is the number of protons and neutrons in nucleus. Every element in the top row besides the hydrogen and helium element, has one orbital for its electrons. then the second row two orbitals, and the third row has three orbitals, and so on and so forth. There are only 7 rows and there is a maximum of 7 orbitals. An orbital is electrons spinning around the nucleus in regions. In the outer electrons those are called valence electrons which are electrons that are involved in chemical bonds with other

They are special because hydrogen doesn't have a neutron, however it has only 1 electron and 1 proton. Even though hydrogen does not have a neutron it is in neutral form. But, it does want to combine with other elements. As for helium it has 2 electrons but is named with the noble gases. Helium has 2 electrons in its valence shell but is quite stable on its own. Not only are just hydrogen and helium special but so are the first 18 elements on the periodic table, because their electrons fit perfectly into three orbitals. Also, because they are the most common, most used, and most known in chemistry.

Noble gases are a small portion of the periodic table, but it has a big importance. These gases are in the far-right column on the periodic table, in which they are in the group 0 or in group 18. Even though nitrogen is in the noble gases, it is not considered to be a noble gas. The noble gases are called the happy elements since all the elements have a full shell. Having a full shell means that they don't need to react with other elements, and the usually don't combine with any other elements. Originally chemists called noble gases inert gases because of their