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ChemActivity 4 Fortoms with many trom, not all electrons are at the same dance from the race in this case, which electres would have the lowest to energy the electro that is done to the news or the electron that is farthe from the nucleus plain 3. Rased on what you have learned so far in this course, predict the relationship between land atomie number by making a rough graphs of Isten number. Discuss possible ideas with your teams and decide which one you think makes the most we DO NOT PROCEED TO THE NEXT PAGE UNTIL YOU HAVE MADE YOUR PREDICTED ORAPA The Shell Model (1) (How Are Electrons Arranged WARM-UP Electrons in atoms are atracted to the nucleus by a Coulombie force. As shown in CA energy must be supplied by some means to pull an electron away from the des, thereby creating a positively charged species, or ration, and a free electron For real atoms, which may co more than electron, the minimum energy required to remove an electron from a seus atom of that element is called the first koration (1) of that element Ionisation energies are usually obtained experimentally. One method of measuring lonization energies is the electron impact method. Atoms of a given clement are bombarded with fast-moving electrons from another source of these fast-moving electrons have suficient energy, they will, on colliding with an atom, jest one of the atom's electrons. The first ionization energy corresponds to the smallest amount of energy that a bombarding electron needs to be able to knock off one of the atom's electrons. Model 1: First lonization Energy (IE1). MM) For a Hatom, IE = 2.178 x 10-J. The first ionization energy. IE, for a single atom is a very small number of joules. For reasons of convenience, chemists report the ionization energies of elements in terms of the minimum energy necessary to remove a single electron from cach atom in a mole of atoms of a given element. This results in ionization energies for the elements that are in the range of MJ/mole. (Note that I MJ = 10.) Critical Thinking Questions How much energy does it take to remove an electron from one H atom? TE: ( Mm) b) How much total energy would it take to remove the electrons from two Hatoms? c) Atomic Number How much total energy would it take to remove the electrons from a mole of H atoms? Express this energy in units of J and in units of MJ.