Which element has an atomic number of 9 and an atomic mass of 19?
A. boron
B. carbon
C....
Physics, 12.10.2020 18:01, katielloyd
Which element has an atomic number of 9 and an atomic mass of 19?
A. boron
B. carbon
C. sulfur
D. fluorine
Answers: 2
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Answers: 1
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