The neutral atom has 27 electrons.
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Silicon has 14 electrons.
Two total electrons are transferred in the reaction 2NaCl. Two electrons are lost from the sodium but gained for the chloride.
Be (beryllium) has four electrons total: the first orbital, the 1s orbital, has two, which leaves two electrons in the outer shell.
Sulfur's atomic number is 16. Therefore, neutral sulfur has 16 protons and 16 electrons. Since we're dealing with S2-, we need to add 2 electrons to that, giving 18 total.
3: The total number of electrons in any neutral atom is always the same as the atomic number of the element.