CHAPTER 1 1) Carbon can be represented as C 12 6 + How many protons, neutrons and electrons can be found in this carbon atom? + What is the element of the Periodic Table, which can be represented by X 13 6 ? 2) The atomic number of Boron (B) is Z = 5. This element has two isotopes. The more abundant (81.2%) has 6 neutrons, and the less abundant (18.8%) has 5 neutrons. + Use the formalism to describe both isotopes. + What is the atomic weight of boron? X A Z 3) What is the electron configuration of magnesium ( ) and fluorine ( )? Mg 24 12 F 19 9 + What is the most stable ion of magnesium? + What is the most stable ion of fluorine? + What is the simplest salt (compound), which can be formed from magnesium and fluorine? 4) The atomic number of hydrogen (H) is 1, and the atomic number of silicon (Si) is 14.
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