<h2>Organizing Elements in the Periodic Table</h2>
The different <a data-lesson="the-building-blocks-of-life" data-subject="biology" data-tutorial="chemical-foundation-of-life" href="https://app.ulearngo.com/biology/chemical-foundation-of-life/the-building-blocks-of-life">elements</a> are organized and displayed in the periodic table. In 1869, Russian chemist Dmitri Mendeleev (1834–1907) devised the periodic table. The table groups elements that, although unique, share certain chemical properties with other elements.
The properties of elements are responsible for their physical state at room temperature. Basically, elements may be gases, solids, or liquids. Elements also have specific chemical reactivity, the ability to combine and to chemically bond with each other.
<div class="wp-caption alignnone" id="attachment_95066" style="width: 1000px"><a href="https://data.ulearngo.com/assets/1d4fa8c4-d888-4eff-bb46-57f188818fe9"><img alt="the-periodic-table" class="wp-image-95066 size-full" height="799" src="https://data.ulearngo.com/assets/1d4fa8c4-d888-4eff-bb46-57f188818fe9" width="1000"/></a>The periodic table shows the atomic mass and atomic number of each element. The atomic number appears above the symbol for the element and the approximate atomic mass appears below it. Image Attribution: OpenStax Biology (<a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>)</div>
In the periodic table, shown above, the elements are organized and displayed according to their atomic number. Also, the elements are arranged in a series of rows and columns based on shared chemical and physical properties. In addition to providing the atomic number for each element, the periodic table also displays the element’s atomic mass.
Looking at carbon, for example, its symbol (C) and name appear, as well as its atomic number of six (in the upper left-hand corner) and its atomic mass of 12.11.
The periodic table groups elements according to chemical properties. The differences in chemical reactivity between the elements are based on the number and spatial distribution of an atom’s electrons. Atoms that chemically react and bond to each other form molecules.
Molecules are simply two or more <a data-lesson="chemical-reactions-molecules" data-subject="biology" data-tutorial="chemical-foundation-of-life" href="https://app.ulearngo.com/biology/chemical-foundation-of-life/chemical-reactions-molecules">atoms</a> chemically bonded together. Logically, when two atoms chemically bond to form a molecule, their electrons, which form the outermost region of each atom, come together first as the atoms form a chemical bond.

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The Periodic Table

Biology studies life and living organisms. Biology can be divided into different sections that cover the morphology, physiology, anatomy, behavior, and so on of living organisms.

Biology

Discover the basic concepts of chemistry that serve as the foundation of life, including the structure of atoms and the periodic table, as well as the role of water, carbon and organic compounds in living organisms.


The Periodic Table

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