What happens when a neutral atom gains an electrons?

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

What are the north and south poles of a solenoid change with?

How many neutrons does plutonium -196 with an atomic number of 78.