Final answer:
The correct electron-dot structure for an atom of selenium is represented by option a. Se: ***. This structure shows the arrangement and number of valence electrons in a selenium atom.
Step-by-step explanation:
The correct electron-dot structure for an atom of selenium is option a. Se:
***
In this structure, the symbol 'Se' represents the selenium atom, and the three dots surrounding it represent its three valence electrons. A valence electron is an electron in the outermost shell of an atom that is involved in chemical bonding. Selenium has six valence electrons, represented by three pairs of dots in the electron-dot structure.
This electron-dot structure helps us visualize the arrangement and number of valence electrons in a selenium atom, which is essential in understanding its chemical behavior and reactions.
Learn more about electron-dot structure