Periods, the horizontal rows in the periodic table, Number of Neutrons, it is calculated by subtracting the atomic number from the atomic mass., Element, these are pure substances that cannot be broken down anymore, Atomic Number, Found at the top left of the element to indicate the atomic number of that element, Groups, the vertical columns in the periodic table., Atomic Mass, Found at the bottom of the element symbol to indicate the mass of that element

Grade 7 Natural Sciences

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