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Chemistry, 12.02.2021 05:20 katherineweightman

1.9/4 Be+42He⎯→ ? +10n
2. 22/11 NA + ? — 22/10 NE

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1.9/4 Be+42He⎯→ ? +10n
2. 22/11 NA + ? — 22/10 NE...

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