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6. plasma analysis. Jelle Kaastra. Introduction. What is a . photoionised. plasma?. Plasma where apart from interaction with particles also . interaction with photons . occurs. Photon spectrum needs to . Definition of the first ionisation energy. The energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of ions with a single positive charge is called the first ionisation energy.. First ionisation energy The first ionisa tion energy of an element is the energy required to remove one electron from each of a mole of free gaseous atoms of that element to form 1 mole of gaseous Density Controls. Controlled by:. 1.) Temperature. 2.) Salinity. 3.) Pressure. Density increases with increasing salinity. Density increases with decreasing temperature.. Density increases with increasing pressure.. Increasing/Decreasing Intervals. AII.7 - The . student will investigate and analyze . functions algebraically . and graphically. Key concepts include. a) . domain . and range, including limited and discontinuous . x. 0.5. x. 2. -2. 2. -1. 0.5. 0. 0. x. 0.5. x. 2. 0. 0. 2. 2. 3. 4.5. As . x . increases. y . decreases. As . x . increases. y . increases. This function is . decreasing when . x. < 0. This function is . Periodicity . REVISION. Elements are the simplest substances and consist of one type of atom.. They are arranged in the Periodic table in increasing atomic number.. NEW LEARNING. Grouping elements by bonding and structure – focus on Titanium. The Periodic Table. 1) Explain . the changes in ionisation energy of elements across each period, and down each group (refer to nuclear charge, atomic radius and electron shielding)..  . 2) Describe . 2. The denser the atmosphere…. the greater its weight, and . the greater its air pressure.. 3. atmospheric pressure -. . a.k.a. .; . barometric pressure or air pressure.. the pressure due to the weight of the overlying atmosphere.. (Chpt. 7). Atomic radius . (size). Ionization energy. Electronegativity. The three properties of elements whose changes across the periodic table are to be investigated are:. Trends in Atomic Radii. REVISION. Elements are the simplest substances and consist of one type of atom.. They are arranged in the Periodic table in increasing atomic number.. NEW LEARNING. Grouping elements by bonding and structure – focus on Titanium. Learning Objectives:. Define first ionisation energy.. Write equations for first and successive ionisation energies.. Explain the factors affecting ionisation energy.. Describe the trends in ionisation energies in Period 3 and Group 2.. Which one of these weighs more???. A kg of bricks or a kg of feathers?. Both of the objects are 1 kg… so they both weight the same. . So why do we want to say bricks????. A kg of bricks may not weigh more, but it does have a higher density!!!. •Explain the factors that influence ionisation energies.. •Predict the number of electrons in each shell as well as the element’s group, using successive ionisation energies.. Key Words:. Electrons, first ionisation energy, successive ionisation energies, electron shielding. .