Exercises1Keys

Exercises1Keys - CHAPTER 1 1) Carbon can be represented as...

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CHAPTER 1 1) Carbon can be represented as C 12 6 + How many protons, neutrons and electrons can be found in this carbon atom? 6 protons, 6 neutrons, 6 electrons. + What is the element of the Periodic Table, which can be represented by Carbon: it is an isotope of 12 C with 7 neutrons instead of 6. 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? (81.2/100)11 + (18.8/100)10 = 10.812 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? Mg ------> Mg ++ + 2 e - (Mg ++ dication ) + What is the most stable ion of fluorine? F + 1 e - ------> F - (Fluoride anion) + What is the simplest salt (compound), which can be formed from magnesium and fluorine?
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