Therefore, the atoms of the element lithium (Li)Number of protons = 3Electrons = 3And neutron = 4 a Electron arrangementIn the arrangement of electrons in atoms1. the electron that ran around the nucleus is based on the energy level. Energy level close to the nucleus (class K), there will be a low-energy electron energy level, and the next layer comes out, there will be more high energy, respectively. The energy of the electron's energy class K < < < < L M N O P Q < < The class 1, 2 or 3-4 < < < < < < 5 6 7.
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