The 3rd round plug is the ground connection.
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The ion formed by an arsenic atom is As3- (arsenide ion) when it gains three electrons or As3+ (arsenite ion) when it loses three electrons.
No ozone is not an ion. It is a molecule which is formed by three atoms of oxygen.
The correct name for the N3- ion is nitride ion. It is a negatively charged ion with a -3 charge that is formed by gaining three electrons.
When iron loses three electrons it becomes ferric (Fe3+) ion
A Bohr diagram for a sulfide ion would consist of ten electrons distributed in three energy levels around the nucleus. The first energy level would have two electrons, the second energy level would have eight electrons, and the third energy level would have none.