Question

____are both centrally located in an atom's nucleus, while ______ electrons surround the nucleus in designated shells (which are commonly thought of as "orbits" as labeled in the PhET simulation).

Answer 1

Protons and neutrons are both centrally located in an atom's nucleus, while negative electrons surround the nucleus in designated shells (which are commonly thought of as "orbits" as labeled in the PhET simulation).
Nucleus of an atom has positive charge, electrons are negative and atom has neutral net charge.

Answer 2

Answer: Protons and neutrons are present in nucleus and negatively charged electrons surround the nucleus.

Explanation:

There are 3 subatomic particles present in an atom. They are protons, electrons and neutrons.

• Protons: They carry positive charge and are found in the nucleus of an atom.
• Electrons: They carry negative charge and are found around the nucleus of an atom.
• Neutrons: They do not carry any charge and are found in the nucleus of an atom.

A nucleus of an atom carries all the mass and it is because of the presence of neutrons and protons.

Hence, protons and neutrons are present in nucleus and negatively charged electrons surround the nucleus.