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What is a particle inside an atom that carries a positive electrical charge?

Answer 1

#"A proton..............."#

Note that the assignment of charge is entirely arbitrary, and a bit unfortunate for #"quantum chemists"# (but not so for #"nucular physicists,"# who don't have to be so careful in multi-proton as compared to multi-electron calculations.) The point is that charged, massive nuclear particles, #"protons"#, have an equal but opposite electronic charge to charged, extranuclear particles of negligible mass, #"electrons"#.

See here for a practical example of assignment of charge on an ion.

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Answer 2

Xavier Avery

A proton is the name for the positive electrically charged particle that resides inside an atom.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.