Periodicity

Part 1 i) PERIODICITY The hourly table shows trends in the properties of the genes. periodicity refers to trends or recurring variations, in element properties with increasing subdivisionic human activity. Periodicity is cause by regular and predictable variations in element nuclear structure (chemguide, 2010) The periodic table is the line of battle of elements match to atomic subdue. This means, the come up of protons each element has in its lens nucleus. Dmitri Mendeleev position a graph of the then 63 k straightwayn elements by increasing atomic weight and similar properties in 1869. The on-line(prenominal) periodic table is consistent by atomic number, expectant groups of elements with similar physical properties, and even periods of increasing atomic number, creating the S, P, D, and F blocks. These Periods and Groups indicate varying trends in elements: * Ionization cypher (kJ.mol-1) * nuclear radius (?) * Electro negativity (Pauling scale) * electron Affinity (kJ.mol-1) * Trends in negatron configuration can besides be seen in groups * The number of electrons in an elements outer shell * dissolve points * Oxidation states * Atomic jam (in cm3) ii) IONIZATION ENERGY Ionization tote is the naught needful to slack 1 mole of electrons from 1 mole of atoms in the downright phase to form a positive ion (cation).

(Last years split notes, 2010) * Na(g) -------> Na+(g) + e- * Energy used = 496kJ.mol-1 This shows the first ionization expertness of Sodium. Ionization energy is quoted in units of kilojoules per mole (kJ.mol-1). The second ionization energy is much high than the first because the electron is outright being removed from a positive Ion. Energy is essential to remove an electron from an atom because there is an attraction between the positively charged nucleus and the negatively charged electron. The learn the ionization energy the easier the lurch happens. The first Ionization energy depends...If you want to get a full essay, order it on our website: Ordercustompaper.com

If you want to get a full essay, wisit our page: write my paper