Question

what is inside an atom?
democritus and john dalton thought that atoms could
not be divided into smaller parts. j. j. thomson and ernest
rutherford discovered that atoms are not indivisible, but
contain electrons and nuclei. later, other scientists discov-
ered that the nucleus of an atom contains smaller particles
called protons and neutrons. each of these subatomic
particles—protons, neutrons, and electrons—has different
properties, as shown in the table below.
as you can see from the table, the nucleus of an atom
contains protons and neutrons. protons have a positive
charge. neutrons do not have a charge. protons and
neutrons are almost identical in size and mass.
outside the nucleus is a cloud of negatively charged
electrons. electrons have a negative charge. the mass of
electron is much smaller than the mass of a proton or
a neutron.

Explanation:

En la tabla y el texto se indica que los protones y neutrones se localizan dentro del núcleo del átomo.

Answer:

Protones y neutrones.