The energy required to remove one electron from the atom is low hence the atom will form compounds where it has a charge of +1.
The photoelectron spectrum can be used to determine the energy of electrons in atoms and molecules. The technique depends on the use of ultraviolet light to cause ionization of atoms from chemicals species and the binding energy of these electrons are determined.
From the question, we can see that there are two values of binding energy. However, the magnitude of difference between the energy levels is high so the electrons can not be in one shell. Therefore, the element will form compounds in which it has a charge of +1.
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