_____________________ is the amount of energy needed to remove an electron from an atom.
Monoatomic
Alkali
Halogens
Radioactivity
Ionization energy
Ionization energy
Ionization energy
The correct answer is "Ionization energy". Ionization energy refers to the amount of energy required to remove an electron from an atom or ion in the gas phase. It is a measure of the strength of the attraction between the nucleus and the outermost electrons of an atom. The ionization energy can vary depending on the specific atom and its electron configuration.
To determine the ionization energy of an atom, you can refer to the periodic table. The ionization energy generally increases as you move from left to right across a period and decreases as you move down a group.
In the given options:
- "Monoatomic" refers to single atoms and is not specifically related to ionization energy.
- "Alkali" refers to a group of elements with low ionization energies, but it does not directly describe the energy needed to remove an electron.
- "Halogens" refers to a group of elements with high ionization energies, but doesn't encompass the concept itself.
- "Radioactivity" refers to the emission of radiation from unstable atomic nuclei and is not directly related to ionization energy.
Therefore, "Ionization energy" is the term that specifically describes the amount of energy required to remove an electron from an atom.