Answer:
19 because it gained 3 electron so 12-3=9 beryllium
2
3 is 46-2=44
4 is 2
5 is 5
6 84 polonium
7
8 oxygen
Explanation:
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Selenium (Se)
The covalent polar bond is in compound of carbon and selenium - carbon selenide CSe₂.
They all look like there decaying and was left out or sat inside too long