The electronic configurations of five atoms are shown. A: An atom with 3 electron shells, containing 2 electrons in the first shell, 8 in the second, and 8 in the third. B: An atom with 3 electron shells, containing 2 electrons in the first shell, 8 in the second, and 7 in the third. C: An atom with 3 electron shells, containing 2 electrons in the first shell, 8 in the second, and 4 in the third. D: An atom with 2 electron shells, containing 2 electrons in the first shell, and 6 in the second. E: An atom with 3 electron shells, containing 2 electrons in the first shell, 8 in the second, and 6 in the third.

1. (a)Which electronic configuration represents each of the following descriptions? Each electronic configuration may be used once, more than once or not at all.
2. (a)(i)a sulfur atom[1]
3. (a)(ii)a metal atom[1]
4. (a)(iii)an atom with a proton number of 14[1]
5. (a)(iv)an atom of a noble gas with three occupied electron shells[1]
6. (a)(v)an atom which forms a noble gas electronic configuration when it loses two electrons[1]
7. (b)The element germanium has five naturally occurring isotopes. An isotope of germanium is represented by the symbol shown. ^{76}_{32}Ge
8. (b)(i)What is the meaning of the term isotopes?[1]
9. (b)(ii)Deduce the number of neutrons in one atom of this isotope of germanium.[1]

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