Question

4) How does an atom have a charge of -3?

Answer 1

Answer: when it gains three electrons

Step-by-step explanation:

In compounds an atom can have a charge of -3 after another atom gives it 3 more electrons (which are negatively charged) so even when it is gaining and you give it negatively charged atoms it will have a negative charge

Answer 2

When the electrons hit the atoms in the chamber, they cause some of the electrons in the atoms to be stripped or knocked away. ... When one or more electrons is knocked off of an atom, it becomes positively charged. It is now an positive ion. A negative ion can be made by adding an electron to an atom.

Step-by-step explanation: