By Nuh ÖZDİN, Ali Serhat ÖZ, Hasan KARABÜK, Uğur Hulusi PATLI, Ali Rıza ERDEM
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Extra info for Chemistry The History of Atom, The Periodic Table and Radioactivity (Zambak)
But it is impossible to measure the atomic radius by separating the atoms from each other. Atomic Radius within a Group The atomic radius of a metal is equal to half the distance (r1) between the nuclei of the neighbouring metal atoms. 1 meter is equal to 1012 picometers. Since the number of shells increases in the same group from top to bottom (by the period number increases), the atomic radius also increases. This means that the electron cloud around the nucleus becomes larger. The increase in the number of electrons causes them occupy a new energy level and orbitals.
5). 2. The atomic number is bigger than 83. On the other hand, we can not absolutely say that the isotopes of elements with an atomic number smaller than 83 are all stable. For example, although 126C is stable, the isotope 146C is unstable, it is radioactive. Radioactivity depends on the structure of the nucleus, which contains protons and neutrons. 2. TYPES OF RADIOACTIVE DECAYS A radioactive substance decays by making mainly three types of emissions. These emissions are named as alpha, beta and gamma, and represented by symbols D, E and J respectively.
In 1895 he discovered helium as a decay product of uranium and matched it to the emission spectrum of an unknown element in the sun that was discovered in 1868. He went on to discover neon, krypton and xenon, and realized these represented a new group in the periodic table. Henry Moseley 1919 Determined the atomic number of each of the elements. Modified the “Periodic Law” to read that the properties of the elements vary periodically with their atomic numbers. 1940 Synthesized transuranic elements (the elements after uranium in the periodic table).