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Grade 5 E-2 Sci. Def

Chapter 2 Atoms and Elements

TermDefinition
nucleus (cell) The organelle that controls all of a cell's activities
proton A subatomic particle with a positive charge
neutron A subatomic particle with no charge
electron A subatomic particle with a negative charge
element A substance made up of only one kind of atom
atom The smallest unit of an element that has all the properties of that element
molecule A grouping of two or more atoms joined together
periodic table The table of elements in order of increasing atomic number; grouped by similar properties
compound A substance made of the atoms of two or more different elements
Created by: scscolts
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