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Na (Sodium) has a +1 charge. Kazyan: See above, but some exotic chemistry has produced sodium ions that are negative: -1.
Valence electrons are the outermost electrons, and are the ones involved in bonding. Sodium has 11 electrons: its atomic number is 11, so it has 11 protons. Atoms are neutral, so this means that sodium also has 11 electrons Electrons are arranged in shells or energy levels. The first evel can have 2 electrons; The second level can have up to 8 electrons.