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What are the smaller particles that make up protons and neutrons?

Answer 1

Quarks which are held together by gluons.

Though there are six different kinds of quarks, protons and electrons only contain the up and down quarks.

The up quark has an electric charge of #+2/3#. The down quark has an electric charge of #-1/3#

The proton and neutron are composed of three quarks:

Proton - Electric charge of #+1# Has two up quarks and one down quark to get a charge of positive 1 since (#2/3+2/3-1/3=+1#)

Neutron - Electric charge of #0# Has one up quark and two down quarks to get a charge of zero since (#2/3-1/3-1/3=0#)

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Answer 2

Kai Bowman

Quarks.

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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.