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The charge on the selenium ion [tex]Se^{+4}[/tex] is +4 as it loses four electrons.
An ion is a particle formed when a neutral atom gains or loses electrons.
Metallic atoms become positive ion by losing electrons whereas non-metallic atoms become negative ions by gaining electrons.
Selenium is a metallic atom and loses electrons to become a positive selenium ion.
The charge on the selenium ion [tex]Se^{+4}[/tex] is +4 as it loses four electrons.
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