An element’s in the periodic table shows its . Each is an energy level. • For most elements, the outermost level is only with electrons. • Electrons in the outermost level are called . They allow atoms to and form or substances. The number of valence electrons determines how an element reacts with other elements. • For the first 3 rows: To find the number of valence electrons for elements in the first three rows, count how far along in a row the element is, and that number is the number of valence electrons. • Many depend on valence electrons
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The cellular plasma membrane is selectively permeable, which means some materials move through it while others cannot. the movement of materials into and out of the cell is called membrane transport. this activity will you identify the different mechanisms of membrane transport
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An element’s in the periodic table shows its . Each is an energy level. • For most elements, the...
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