Unit 2.1 What Does It Matter?
This Second Grade unit is the FIRST in the curriculum of three (3) units developed to address the Second Grade science standards of the Michigan Science Standards related to Matter.
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While too small to be seen with visible light, atoms have substructures of their own. They have a small central region or nucleus—containing protons and neutrons—surrounded by a larger region containing electrons. 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. Despite the immense variation and number of substances, there are only some 100 different stable elements.