Atoms, Molecules, and Elements Paper

Mendeleevs table is based on atomic weight and the

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differences in chemical properties. Mendeleev’s table is based on atomic weight and the elements were placed in order of increasing atomic number. The atomic number represents the number of protons in the nucleus of the elements atom. The horizontal columns on the table are called periods and the vertical columns are called groups, and the table was organized so the elements that are similar properties were found in the same columns (Barcodes, 2013). Based on the number of electrons that alkali metals contain in their outer shell, Dmitri Mendeleev would have understood why they were considered highly reactive. This allows them to easily lose its valence electron to form other molecules. Halogens have seven valence electrons and are also considered reactive. The halogen group is especially reactive with the alkali metals and alkaline earths, producing stable ionic crystals. The elements that contain eight valence electrons in the outer shell, like noble gases which are nonreactive because they are considered complete (Helmenstine, 2013).
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Electronic Structure The electronic structure of an atom is how the electrons are arranged within that atom. It also
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