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Chemistry - Essay Example

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(ii) From your answer in (i) calculate the mass of oxygen and the mass of aluminium that combines with one mole of beryllium atoms to produce beryllium di-aluminate. How many moles of oxygen atoms and how many of aluminium atoms do these masses represent.
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Download file "Chemistry" to see previous pages... Aluminium is metal with atomic number 13 and it will combine by loosing two electrons. Beryllium and aluminium are metals and will combine with other elements by loosing electrons while oxygen will combine by gaining electrons, therefore our empirical formula will have the following formula:
Isotopes of an element have the same number of protons but differ in the number of neutrons; the atomic number is equal to the number of protons therefore Pn has the atomic number 117.
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Because atoms are neutral then the number of electrons is equal to the number of neutrons.
The atomic number is 117; this means that the electronic arrangement is 2: 8:18:32:50:7 this is given by the formula 2N2 which give us the maximum number of electrons in each cell where N is the shell number. We have 6 shells and 7 electrons in the last shell, this means that the element belongs to the 7th period and the 17th group.
The empirical formula will be Pn2O7 because oxygen will tend to gain two electrons or loose 6 electrons and Pn will also tend to gain one electron or loose 7 electrons, therefore the highest normal oxide will be loosing Pn loosing seven electrons and Oxygen gaining two electrons.
Six decays means loosing six neutrons, and bearing in mind that the number of neutrons is equal to the number of electrons and that the number of electrons is equal to the number of protons then our resulting element will have an atomic number 67-6 = 61. ...Download file "Chemistry" to see next pagesRead More
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