Answer:
10 electrons will be present in an O2-
Explanation:
The atomic nucleus of oxygen contains 8protons and 8 neutron. It ionizes by gaining two more electrons making the total number of electrons in a doubly ionized oxygen to be 10 electrons.
The box is expected to go to the right since the 3N is stronger than the 2N and the rightward force will over come the leftward force.
Ra (radium) is the most reactive