Chemistry, 09.11.2020 09:10, graciemccain

The picture shows a periodic table with elements X and Y. If the atomic number of element X is 3, then what is the atomic number of element Y?
A. 5
B. 7
C. 19
D. 25

Answers: 2

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The picture shows a periodic table with elements X and Y. If the atomic number of element X is 3, t...