What is electronic configuration and ionisation energy?

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Explanation:

Ionization Energy and Electron Configuration Chemistry Tutorial Electron configuration is also referred to as electronic configuration. Ionization energy, or ionisation energy, is the energy required to remove an electron from a gaseous atom or ion. ... The lower the value of the ionization energy, the easier it is to remove an electron from the gaseous species.

Ionisation energy is defined as the energy required to remove an electron from the outer most shell of an isolated gaseous atom in its ground state.

The electron configuration of an element describes how electrons are distributed in its atomic orbitals.

i think its c if i'm wrong