Barium has 2 valence electrons. Valence electrons are the electrons in the outermost shell of an atom, which are involved in chemical bonding. Barium, with the atomic number 56, has an electron configuration of [Xe] 6s². This means that in its outermost shell (the 6th shell), barium has 2 electrons. These 2 electrons are the valence electrons of barium.
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