Which of the following elements posses the fewest valence electrons?

Idon't understand is there supposed to be a list or something if there is pm or add in under this message i will do my best to .

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.

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