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What does a neutral atom always contain?

Answer 1

#"Protons"# and #"electrons"# in equal numbers.

The neutral atom may also contain #"neutrons"#, massive nuclear particles of zero charge. However, the protium isotope, #""^1H#, which is the most abundant material in the universe so far as I know, contains NO neutrons.

In a neutral material, or atom, there must be an equal number of protons, which are massive nuclear particles with unit positive charge, and electrons, which are extra-nuclear particles with negligible mass AND unit negative charge.

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Answer 2

Axel Alvarado

Protons and electrons are always distributed equally in a neutral 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.