The electronic configurations of five atoms are shown. [Figure A, B, C, D, E showing electronic configurations]

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 sodium atom[1]
3. (a)(ii)an atom of a reactive non-metallic element[1]
4. (a)(iii)an atom with a proton (atomic) number of 12[1]
5. (a)(iv)an atom of a noble gas which is used to fill balloons[1]
6. (a)(v)an atom which forms a noble gas electronic configuration when it gains two electrons[1]
7. (b)Chlorine has two naturally occurring isotopes. One isotope of chlorine is represented by the symbol shown. 37 17C1
8. (b)(i)Deduce the number of neutrons in one atom of this isotope of chlorine.[1]
9. (b)(ii)Chlorine has diatomic molecules. What is the meaning of the term diatomic?[1]

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