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Phrase:    11. isotope Phonics:   Audio:	Phrase:    12. protium Phonics:   Audio:
Phrase:    13. relative isotopic mass Phonics:   Audio:	Phrase:    14. relative abundance Phonics:   Audio:
Phrase:    15. shell Phonics:   Audio:	Phrase:    16. electronic arrangement Phonics:   Audio:
Phrase:    17. electron diagram Phonics:   Audio:	Phrase:    18. orbital Phonics:   Audio:

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