1.(i) An element X has atomic number 3, relative atomic mass 6.94 and consist of twoisotopes of mass numbers 6 and 7. What is the mass number of the more abundantisotope of X? Give a reason for youranswer...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(ii) Complete the followingtableMass number of isotope Number of neutrons Number of electrons
Question
1.(i) An element X has atomic number 3, relative atomic mass 6.94 and consist of twoisotopes of mass numbers 6 and 7. What is the mass number of the more abundantisotope of X? Give a reason for youranswer...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(ii) Complete the followingtableMass number of isotope Number of neutrons Number of electrons
Solution 1
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Solution 2
(i) The more abundant isotope of X has a mass number of 7. This is because the relative atomic mass of X is closer to 7 than to 6. The relative atomic mass is a weighted average of the mass numbers of the isotopes, taking into account their relative abundances. Since the relative atomic mass of X is closer to 7, this indicates that the isotope with a mass number of 7 is more abundant.
(ii) To complete the table, we need to know the atomic number of the isotope. The atomic number is equal to the number of protons, and in a neutral atom, the number of protons is equal to the number of electrons. The number of neutrons can be found by subtracting the atomic number from the mass number.
For example, if the mass number of the isotope is 7 (as in the case of the more abundant isotope of X), and the atomic number is 3 (as given), then the number of neutrons is 7 - 3 = 4 and the number of electrons is 3.
So, the table would look like this:
| Mass number of isotope | Number of neutrons | Number of electrons |
|---|---|---|
| 7 | 4 | 3 |
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