By Nuh ÖZDİN, Ali Serhat ÖZ, Hasan KARABÜK, Uğur Hulusi PATLI, Ali Rıza ERDEM
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Additional resources for Chemistry The History of Atom, The Periodic Table and Radioactivity (Zambak)
That is why we cannot talk about the relationships of ionization energies of these elements. 6 Which atom of the 3Li and 19K would have the higher first ionization energy? Let us first write the electron configurations of these atoms. 3Li : 1s2 2s1 and 19K : 1s2 2s2 2p6 3s2 3p6 4s1 From the electron configurations we can see that lithium is in the 2nd period, group 1A, and potassium is in the 4th period, group 1A. Since lithium is above potassium in the same group, the atomic radius of lithium is smaller than that of potassium but the first ionization energy is higher.
Some periodic tables. 30 The History of the Atom, The Periodic Table and Radioactivity 1. THE MODERN PERIODIC TABLE The modern periodic table appeared as a function of the physical and chemical properties of elements. When the elements are arranged in the order of increasing atomic numbers, there is a periodic repetition in the properties of these elements. A simple periodic table contains the symbols, atomic numbers and the relative atomic masses of the elements. Additionally, detailed periodic tables containing some physical and chemical properties (such as melting point, boiling point, oxidation state) are also made.
Find the group numbers of the elements with electron configurations ending with s1, s2, s2p5 and s2p6. 18. Although helium has an electron configuration of 1s2, it is shown in the group of noble gases. Explain. What can you say about the values of a and b? 2. What is the law of octaves? Explain. 3. What were the periodic properties of the elements upon which Mendeleev and Meyer established their periodic table of the elements? 4. 5. 6. Mendeleev left some places empty in his periodic table, when he was arranging the elements according to increasing atomic weight.
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