Atomic Structure. What are the 3 major parts of an atom?. What are the 3 major parts of an atom?. Proton Neutron Electron. Draw a diagram showing the location of each part of the atom. Draw a diagram showing the location of each part of the atom.
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Electrons are negatively charged particles that surround the atom's nucleus. Electrons were discovered by J. J. Thomson in 1897.
Electrons determine properties of the atom. Chemical reactions involve sharing or exchanging electrons.
The nucleus is the central part of an atom. It is composed of protons and neutrons.
The nucleus contains most of an atom's mass.
It was discovered by Ernest Rutherford in 1911.
Atoms that have the same number of protons but different numbers of neutrons
Model of the atom pictures the electrons moving around the nucleus in a region called an electron cloud.
The electron cloud is a cloud of varying density surrounding the nucleus. The varying density shows where an electron is more or less likely to be. Atoms with electrons in higher energy levels have additional electron clouds of different shapes that also show where those electrons are likely to be.
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