Why is lead used in pencils even though lead is poisonous?
Why do atoms always contain the same number of electrons and protons?
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The core of a pencil does not contain lead and never has. Pencils contain a form of solid carbon known as graphite. Black-core pencils currently contain and have always contained graphite, not lead.
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral. ... Chemically, we say that the atoms have formed bonds.
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