You must include the following vocabulary words correctly in the timeline: however, you are not limited to just these words. The topics or people that must be included in your timeline are: Your digital timeline should be neat, clearly labeled, and should include any images or illustrations that help clarify the information being presented. The digital timeline should be structured around each of the eight important topics or people listed below.įor each of the topics or people listed below, you will need to include the year (or approximate year), the theory that was proposed, the experiments associated with the theory, and an explanation of the importance of the theory or experiment. Chemical reactions largely involve atoms or groups of atoms and the interactions between their electrons.Using what you have learned about the history of atomic theory in this module, create a digital timeline which outlines the important discoveries and details in the evolution of understanding of the structure of the atom through the discovery of the nucleus. In general, electrons are easier to add or remove from an atom than a proton or neutron. The particles within an atom are bound together by powerful forces.Isotopes and ions of an atom with a constant number of protons are all variations of a single element. Varying the number of electrons results in ions. Varying the number of neutrons results in isotopes. The number of protons (also known as its atomic number) determines the element.Almost all of the mass of an atom is in its nucleus almost all of the volume of an atom is occupied by electrons.Electrons move around outside the nucleus.The nucleus carries a positive electrical charge. The nucleus of an atom contains protons and neutrons.The mass of a proton is 1840 times greater than the mass of an electron. The mass of a proton is essentially the same as that of a neutron.Protons and neutrons are about the same size as each other and are much larger than electrons. This lesson plan covers major developments and changes in atomic theory, with a focus on the 1800s and 1900s.In other words, neutrons do not have a charge and are not electrically attracted to either electrons or protons. Electrons and protons are electrically attracted to each other. The charge of a proton and an electron are equal in magnitude, yet opposite in sign. Each proton has a positive electrical charge.Each electron has a negative electrical charge.Some scientists will have more than one description associated with them. Your task today is to match the scientist with the appropriate description. The atomic theory timeline spans many centuries, beginning as early as the 5th. ![]() They do consist of parts, which include protons, neutrons, and electrons, but an atom is a basic chemical building block of matter. Chapter 14 - Atomic Theory Scientist Timeline Below is a list of individuals that have made significant contributions to the concept of the atomic theory. The atomic theory deals with tiny particles called atoms which are the building blocks of matter in this universe. Atoms cannot be divided using chemicals.Protons and neutrons are found together in what is called the nucleus of the atom. Electrons have a negative electrical charge. Protons have a positive electrical charge. An atom consists of three main parts: protons, neutrons, and electrons. The fundamental building block of matter is the atom. An atom with too many or too few electrons is unstable and may bond with another atom to either share or essentially donate electrons.Ĭhemistry is the study of matter and the interactions between different types of matter and energy. ![]()
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