Choose the best: Modern periodic law — task. Science State Board, Class 10.

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Select the right answers:

1. Henry Moseley is a __________ scientist.

Spanish
British
Russian
American

2. The atomic mass of potassium is __________.

\(39.10\) AMU
\(39.30\) AMU
\(39.01\) AMU
\(39.20\) AMU

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