Question

using the information from this experiment, scientists determined that thomsons model was not very accurate, so they revised it. the data identified a second atomic particle that is positively charged and located in the center, or nucleus, of an atom. scientists called the particles inside the nucleus protons. they also learned that most of the atom is empty space, and electrons move around in that space. later, scientists learned that there is a neutral particle in the nucleus as well. that particle is called the neutron, and it is similar in size to the proton. the diagram to the right shows rutherfords model and the later revised model that added neutrons.
text chunk 3: write the main idea in your own words or images. (if you are not sure, reread and annotate.)
subatomic particles
from these experiments, scientists agree that all atoms are made up of electrons, protons, and neutrons. each subatomic particle has a specific charge: electrons are negative, protons are positive, and neutrons are neutral. every type of atom contains a different combination of these three subatomic particles.
not only are the charges different among the three subatomic particles, but their masses are as well. electrons are much smaller than protons and neutrons. their relative mass is just 1/2,000 of the mass of a proton or a neutron. this means that it takes 2,000 electrons to equal the mass of one proton or one neutron! protons and neutrons have a similar mass to each other.
our understanding of the structure of the atom and how we model that structure has changed over time. we have a better understanding of atomic structure today, but with new technology, we are learning and revising our model of the atom. scientists are constantly experimenting to learn more about subatomic particles. this research helps us understand how what happens inside atoms can cause the changes we observe in the world around us.
text chunk 4: write the main idea in your own words or images. (if you are not sure, reread and annotate.)

Explanation:

The text first describes how experiments led to the revision of Thomson's atomic model, identifying protons in the nucleus and neutrons later, and that most of an atom is empty - space with electrons moving around. It then elaborates on the sub - atomic particles (electrons, protons, neutrons), their charges, and masses. Our understanding of atomic structure has evolved over time, and ongoing research helps us understand phenomena in the world around us.

Answer:

Text Chunk 3: Experiments led to the revision of Thomson's atomic model, discovery of protons and neutrons, and understanding of atomic structure with a nucleus and electrons in empty space.
Text Chunk 4: Atoms are made of electrons, protons, and neutrons with different charges and masses. Our understanding of atomic structure has evolved and research helps explain real - world changes.