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For an atom of a main group element, the number of valence electrons is equal to its group number. the principle quantum number of its oster shellit. its number of core clectrons. its period number. eight minus its group number.

For an atom of a main group element, the number of valence electrons is equal to its group number. the principle quantum number of its oster shellit. its number of core clectrons. its period number. eight minus its group number.

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For an atom of a main group element, the number of valence electrons is equal to
its group number.
the principle quantum number of its oster shellit.
its number of core clectrons.
its period number.
eight minus its group number.

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