26. Tasks 21-30 have the same condition: indicate the number of protons, electrons and neutrons in the atoms of the isotopes of the element in accordance with your option. Compose the electronic formula of the atom of the element and underline the valence electrons in the formula. Specify which electronic family this element belongs to. Distribute the electrons of the atom into electronic cells and indicate the number of unpaired electrons in the atom in the normal (unexcited) state.
Mn5525, Mn5625

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