Define electronic configuration. How can a number of electrons be calculated?
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Answer:
The number of electrons in the atom is equal to the atomic number of the element. Write the electron configuration for the element in question. Fill the orbitals of the atom in the order 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p and 5s. ... These orbitals contain the valence electrons for the element.