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The committee included this fourth idea to stress the interplay of physical science and technology, as well as to expand students’ understanding of light and sound as mechanisms of both energy transfer (see LS3) and transfer of information between objects that are not in contact.Modern communication, information, and imaging technologies are applications of scientific understandings of light and sound and their interactions with matter.And one thing that should be worrisome for straight men is the size of their disadvantage in the market.Josh Fischer is the Director of Product Insights at What does this mean?Within matter, atoms and their constituents are constantly in motion.The arrangement and motion of atoms vary in characteristic ways, depending on the substance and its current state (e.g., solid, liquid).

The number of protons in the atomic nucleus (atomic number) is the defining characteristic of each element; different isotopes of the same element differ in the number of neutrons only.

For this reason we have chosen to present the two subjects together, thereby ensuring a more coherent approach to the core ideas across all grades. Nuclear reactions involve changes in the types of atomic nuclei present and are key to the energy release from the sun and the balance of isotopes in matter. A: STRUCTURE AND PROPERTIES OF MATTER How do particles combine to form the variety of matter one observes?

The designation of physical science courses at the high school level as either physics or chemistry is not precluded by our grouping of these disciplines; what is important is that all students are offered a course sequence that gives them the opportunity and support to learn about all these ideas and to recognize the connections between them. While too small to be seen with visible light, atoms have substructures of their own.

The development of the periodic table (which occurred well before atomic substructure was understood) was a major advance, as its patterns suggested and led to the identification of additional elements with particular properties.

Moreover, the table’s patterns are now recognized as related to the atom’s outermost electron patterns, which play an important role in explaining chemical reactivity and bond formation, and the periodic table continues to be a useful way to organize this information.

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