Selenium, oxygen, bromine and vanadium, I tried entering what I though was the diatomic number for these, like $\ce{O2}$, $\ce{V2}$, $\ce{Br2}$, $\ce{Se2}$, but it doesn't work. Any feedback on this?


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    $\begingroup$ It would be really nice to know where exactly did you try entering this, and what outcome did you expect. Besides that, some elements do exist as diatomic molecules, some don't. $\endgroup$ – Ivan Neretin Feb 11 at 8:52
  • $\begingroup$ Vanadium is a metal so a diatomic number is meaningless. Selenium is a metalloid which occurs most frequently as a metallic grey crystal so again a diatomic number is not applicable $\endgroup$ – Waylander Feb 11 at 8:54
  • $\begingroup$ I appreciate the input. This is for an introductory chemistry class. Im on chapter two and we learned about anatomic metals, valance electrons, isotopes, and on my hands on lab assignment the exact question is: Complete the following table by providing the symbol or formula that is used to represent a sample of the element under normal conditions. Then there is a list of said chemicals plus barium and others. $\endgroup$ – Stu Pedaso Feb 11 at 9:24
  • $\begingroup$ Normal conditions means room temperature and pressure. For instance, gold is a solid so you might enter Au(s). Oxygen is a gas so $\ce{O2(g)}$ $\endgroup$ – Try Hard Feb 11 at 13:39