1.1 Mendeleev’s and Moseley Periodic Table Arrangement.
- The periodic table (also known as the periodic table of elements) is organized so scientists can quickly discern the properties of individual elements such as their mass, electron number, electron configuration and their unique chemical properties.
- Metals reside on the left side of the table, while non-metals reside on the right.
- Organizing the elements to help further our understanding was first provided by Dmitri Mendeleev.
- Periodic trends are Specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its size and its electronic properties.
- Major periodic trends include: electronegativity , ionization energy, electron affinity, atomic radius, melting point, and metallic character.
- Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element’s properties.
- These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.
Mendeleev’s and Moseley periodic table arrangement.
- Mendeleev’s periodic table is a tabular display of the chemical elements where they are arranged in order of increasing atomic weight (Atomic mass).
- His table contains some gaps (undiscovered elements)
- He predicted the discovery The physical properties of Sc, Ga,Ge.
- Moseley periodic table is a tabular display of the chemical elements where they are arranged in order of increasing atomic number.