Compare the number of valence electrons an oxygen, O, atom has with the number of valence electrons a selenium, Se, atom has. Are oxygen and selenium in the same period or group?

2 answers

Go to this site and click on O and Se. Scroll down the right side to look for the electronic configuration. You will see both are in the same group and both have similar outer shell electrons.
Compare the number of valence electrons in an atom of oxygen, O, with the number of valence electrons in an atom of selenium, Se. Are oxygen and selenium in the same period or group?
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