11. ionization energy is the amount of energy necessary to
form an anion
remove an electron from an atom
to fill the outer energy level with electrons
form an ionic bond

Ionization energy is the amount of energy necessary to remove an electron from an atom

Explanation:

Ionization consists of the production of ions, which are electrically charged atoms or molecules due to the excess or lack of electrons with respect to a neutral atom or molecule.

In this sense, ionization energy is the energy necessary to separate (remove) an electron from a gaseous atom, isolated and in a fundamental state. This is because electrons are strongly attracted to the nucleus and it is necessary to provide energy to separate them. However, where the atom always loses electrons is in the last layer, which is where the weakest electrons are attracted to the nucleus.

that would be because of both gravity and friction. so     c

conservation of mass

mass before something happens = mass afterwards