eight electrons Click to see full answer. Regarding this, how many valence electrons are in pyridinium ion?Iodine has seven valence electrons.Also, how many valence electrons are in ne2+? 6 valence electrons Additionally, what is valence of ion? Updated January 24, 2019. Valence is typically the number of electrons needed to fill the outermost shell of an atom. Because exceptions exist, the more general definition of valence is the number of electrons with which a given atom generally bonds or number of bonds an atom forms.How many electrons are in an ion?The atomic number is 21, which means that scandium has 21 protons. While a neutral atom for scandium would have the same number of electrons as protons, the ion is shown to have a +3 charge. This means it has 3 fewer electrons than the neutral atom or 21 – 3 = 18 electrons.

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